The correct answer is A. Remove the airway and ventilate him.
In pediatric patients, improper placement or incorrect sizing of an oropharyngeal airway (OPA) can cause:
Airway obstruction instead of opening
Worsening hypoxia
Leading to cyanosis and bradycardia
The patient's cyanosis (low oxygen) and bradycardia (late hypoxia sign) indicate that the airway intervention has failed or worsened the situation.
Immediate action is to:
Remove the OPA
Provide effective ventilations with BVM
B). Continue ventilation with the airway in place # Incorrect because the airway is likely malpositioned or obstructing airflow C). Increase ventilation rate to 40-60 # Excessive and inappropriate; does not correct obstruction D). Start CPR if HR < 100 # In pediatrics, CPR begins if HR < 60 with poor perfusion, not < 100
"If an airway adjunct worsens ventilation, it should be removed immediately."
"Bradycardia in infants is a sign of hypoxia."
"Ensure adequate ventilation before initiating compressions."
References:
NREMT EMT Education Standards - Airway, Respiration & Ventilation
National EMS Education Standards - Pediatric Airway Management
NREMT Candidate Handbook - Airway Management and Resuscitation

Comprehensive and Detailed Explanation (Based on NREMT standards):
Sudden respiratory symptoms following prolonged cleaning strongly suggest chemical inhalation, particularly from cleaning agents such as ammonia or bleach. Mixing chemicals or using them in poorly ventilated areas can release toxic gases that cause coughing, nausea, and dyspnea.
Option D is correct because inhaled chemical irritants commonly cause acute respiratory distress that improves with oxygen therapy.
Option A typically causes chronic symptoms, not sudden onset.
Option B does not cause respiratory distress.
Option C does not explain the environmental exposure or oxygen response.
NREMT emphasizes recognizing environmental hazards and removing patients from the source while providing supportive care.

Return of spontaneous circulation (ROSC) indicates that the patient has regained a perfusing rhythm. If the patient is pushing away the BVM, this suggests improving mental status and spontaneous respirations.
Option D is correct because NREMT post-resuscitation care requires EMTs to reassess airway, breathing, and circulation, including confirming a pulse, and transition from assisted ventilations to supplemental oxygen if the patient is breathing adequately.
Options A and B are inappropriate because restraining a post-ROSC patient is rarely indicated and may worsen agitation.
Option C omits reassessment of circulation, which is critical after ROSC.
NREMT stresses frequent reassessment and supportive care following successful resuscitation.

The correct answer is B. cyanide poisoning.
The key clue in this question is the odor of bitter almonds, which is classically associated with cyanide exposure. Cyanide is commonly used in industrial processes such as electroplating, making this scenario highly suggestive of cyanide poisoning.
Why B is correct:
Cyanide exposure is known for producing a "bitter almond" odor.
It is commonly found in industrial settings, especially electroplating facilities.
Cyanide interferes with cellular respiration, leading to rapid onset of severe symptoms in multiple patients.
Why the other options are incorrect:
A). Ammonia exposure # Produces a sharp, pungent odor, not bitter almonds.
C). Organophosphate poisoning # Typically associated with a garlic or musty odor and cholinergic symptoms (SLUDGE).
D). Chlorine gas exposure # Has a strong bleach-like odor, causing respiratory irritation.
Exact Extracts:
"Cyanide exposure may be associated with a bitter almond odor."
"Industrial processes such as electroplating may involve cyanide compounds."
"Recognition of characteristic odors can assist in identifying hazardous materials." References:
NREMT EMT Education Standards - EMS Operations (Hazardous Materials)
National EMS Education Standards - Toxicology and Environmental Emergencies NREMT Candidate Handbook - Scene Safety and Hazard Recognition

The correct answers are B. Femur fracture and E. Posterior hip dislocation.
This mechanism is classically known as a "dashboard injury", where the knee strikes the dashboard during a motor vehicle collision. The force is transmitted along the femur toward the hip.
Why B is correct (Femur fracture):
The force applied to the knee travels up the femur, which can result in:
Femoral shaft fractures
Significant internal bleeding
NREMT trauma guidance states:
"High-energy impacts to the lower extremities can result in femur fractures." Why E is correct (Posterior hip dislocation):
Dashboard injuries commonly cause:
Posterior displacement of the femoral head from the acetabulum
This occurs when the femur is driven backward while the hip is flexed
NREMT-aligned content:
"A blow to the knee in a seated position can result in posterior hip dislocation." Why the other options are incorrect:
A). Tibia fracture: More commonly associated with direct lower leg trauma, not classic dashboard mechanism.
C). Ruptured peritoneum: Not a typical injury from this mechanism.
D). Rupture of the bladder: More associated with pelvic fractures, not isolated dashboard knee impact.
Exact Extracts:
"A dashboard injury can transmit force up the femur causing hip dislocation."
"Posterior hip dislocation is commonly associated with knee impact in MVCs."
"Femur fractures are common in high-energy trauma."
References:
NREMT EMT Education Standards - Trauma (Musculoskeletal Injuries)
NREMT National Continued Competency Program (NCCP) - Trauma Emergencies Prehospital Emergency Care (EMT) - Mechanisms of Injury and Trauma Assessment