This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory infections, Subject name: Pediatrics
[{'content': 'Infant is admitted with respiratory distress and prolonged expiration with rhonchi in chest. CXR shows hyperinflation. What is the diagnosis? \nSelect and explain. \nA. Pneumonia, B. Croup, C. Asthma, D. Bronchiolitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Given scenario suggests diagnosis of Bronchiolitis: MC LI in infants. Age group 6 months to 2 years. MC agent is RSV.', 'role': 'assistant'}]