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
The volume in question mark is after: 
Select and explain. 
A. Maximum inspiration, B. Maximum expiration, C. Normal inspiration, D. Normal expiration
B: Maximum expiration
Answer: B: Maximum expiration 
Explanation: Ans. (b) Maximum expiration(Ref: Ganong, 25th ed/p.629)It is residual volumeIt is the volume of air left in lungs after forced expiration