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
Routine spirometry can't estimatea)  FRCb)  VCc)  RVd)  ERVe)  FEV1 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: Direct measurement can be done by Spirometry for
-        TV, IRV, ERV, VC, Forced vital capacity, FEV1
Direct measurement by spirometry cannot be done for
 
-        RV, FRC, TLC