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
FRC is volume of air in lung after ? 
Select and explain. 
A. Maximal inspiration, B. Maximal expiration, C. Normal inspiration, D. Normal expiration
D: Normal expiration
Answer: D: Normal expiration 
Explanation: Ans. is d i.e., Normal expiration