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
FEV2/VC: 
Select and explain. 
A. 80-85%, B. 95%, C. 97%, D. 100%
B: 95%
Answer: B: 95% 
Explanation: 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