This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New Born Infants, Subject name: Pediatrics
[{'content': 'Lungs do not collapse during expiration because of the presence of? \nSelect and explain. \nA. Hyaline membrane, B. Dipalmitoyl phosphatidyl choline, C. Macrophages, D. Interstitial fluid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: b. Dipalmitoyl phosphatidyl choline(Ref: Ghai 8/e p 169-170)Dipalmitoyl phosphatidyl choline is an important constituent of Surfactant, which prevent alveolar collapse during expiration.', 'role': 'assistant'}]