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': 'Functional residual capacity is: \nSelect and explain. \nA. Volume remaining after forced expiration, B. Tidal volume + volume inspired forcefully, C. Volume remaining after normal expiration, D. Tidal volume + volume expired by forced expiration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Volume remaining after normal expiration', 'role': 'assistant'}]