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 cannot measure ? 
Select and explain. 
A. RV, B. TV, C. IRV, D. ERV
A: RV
Answer: A: RV 
Explanation: Ans. is 'a' i.e., RV Spirometry can measure :- Tidal volume (TV), inspiratory reserve volume (IRV), expiratory reserve volume (ERV), vital capacity (VC), forced vital capacity (FVC), FEVI. Spirometry cannot measure :- Residual volume (RV), functional residual capacity (FRC), total lung capacity (TLC).