This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'The minor surfactant in lung is \nSelect and explain. \nA. Stearic acid, B. Palmatic acid, C. Phosphotidyl choline, D. Sphyngomyelin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phosphotidyl choline is major surfactant Sphyngomyelin is minor surfactant', 'role': 'assistant'}]