Daily long-term control therapy is recommended for infants and young children (0-4 years) who had in the previous year

Correct Answer: B

Rationale: Three or more wheezing episodes lasting over one day in a year indicate persistent asthma, warranting long-term control therapy.

Correct Answer: B

Rationale: Chest compressions in pediatric basic life support should be delivered with extended elbows for effective force generation.

Correct Answer: D

Rationale: Bacterial tracheitis is most commonly caused by Staphylococcus aureus, leading to severe airway obstruction.

Correct Answer: B

Rationale: Persistent allergic rhinitis is characterized by more frequent and troublesome symptoms that impact daily life, distinguishing it from intermittent cases, which occur less frequently.

Correct Answer: C

Rationale: Climate change poses a major threat to food security by affecting crop yields and causing extreme weather events that disrupt agriculture.