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: Physiology
[{'content': 'In human body, the action of surfactant is done by \nSelect and explain. \nA. Sugar & salt, B. Soap & water, C. Lipid and protein, D. Base and lipid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dipalmitoylphoshatidylcholine is a phospholipid which along with proteins acts as surfactant.', 'role': 'assistant'}]