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
[{'content': 'Spirometry cannot measure ? \nSelect and explain. \nA. RV, B. TV, C. IRV, D. ERV', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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).", 'role': 'assistant'}]