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': 'Tidal volume is calculated by: \nSelect and explain. \nA. Inspiratory capacity minus the inspiratory reserve volume, B. Total lung capacity minus the reserve volume, C. Functional residual capacity minus residual volume, D. Vital capacity minus expiratory reserve volumes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Inspiratory Capacity minus Inspiratory Reserve volume', 'role': 'assistant'}]