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
Normal residual volume is ? 
Select and explain. 
A. 500 ml, B. 12 00 ml, C. 3000 ml, D. 2400 ml
B: 12 00 ml
Answer: B: 12 00 ml 
Explanation: Ans. is'b'i.e., 1200 ml(Ref: Ganong 24e/e p.629)