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
Air volume in lung after normal expiration is called as ? 
Select and explain. 
A. FRC, B. ERV, C. RV, D. TC
A: FRC
Answer: A: FRC 
Explanation: Ans. is 'a' i.e., FRCFRC is the amount of air remaining in the lungs after a normal tidal expiration (FRC = ERV + RV).