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': 'FEV2/VC: \nSelect and explain. \nA. 80-85%, B. 95%, C. 97%, D. 100%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: FEV2:volume expired forcefully by the end of 2th second It is 95%of total vital capacity. Ref: G K Pal textbook of Practical physiology 4th edition ,page number: 159', 'role': 'assistant'}]