This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Applied Aspects and Respiratory Adjustments, 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 o Spirometry can measure :- Tidal volume (TV), inspiratory reserve volume (IRV), expiratory' reserve volume (ERV), vital capacity (VC), forced vital capacity' (FVC), FEV,.o Spirometry cannot measure :- Residual volume (RV), functional residual capacity (FRC), total lung capacity' (TLC).