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 expiratory reserve volume of adult? 
Select and explain. 
A. 500 ml, B. 3000 ml, C. 1200 ml, D. 4500 ml
C: 1200 ml
Answer: C: 1200 ml 
Explanation: Ans. is 'c' i.e., 1200 ml(Ref: Ganong 24n/e p.629)Inspiratory reserve volume - 3000 mlExpiratory reserve voulume -1200 ml