This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
[{'content': 'Tidal volume in a normal man at rest is \nSelect and explain. \nA. 0.5 L, B. 1L, C. 1.5 L, D. 2 L', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normal tidal volume is 500 ml Ref: guyton and hall textbook of medical physiology 12 edition page number:324,325,326', 'role': 'assistant'}]