This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Child's respiratory physiology differs from adult because of - 
Select and explain. 
A. Smaller airways, B. Increased O2 demand, C. Decreased tidal volume, D. Decreased residual volume
A: Smaller airways
Answer: A: Smaller airways 
Explanation: Ans. is 'a' i.e., Smaller airways Younger infants are more vulnerable because : - i) Smaller airways ii) More compliant chest wall iii) Poor hypoxic drive