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
Spirometry measures all of the following, except: 
Select and explain. 
A. Tidal volume, B. Vital capacity, C. FEV, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None of the above