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
[{'content': "Child's respiratory physiology differs from an adult because of – \nSelect and explain. \nA. Smaller airways, B. Increased O2 demand, C. Decreased tidal volume, D. Decreased residual volume", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Younger infants are more vulnerable because : -\n\nSmaller airways\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nMore compliant chest wall\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nPoor hypoxic drive', 'role': 'assistant'}]