This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
[{'content': 'The following illustration of the Spirogram showing the arrow indicates \nSelect and explain. \nA. Tidal volume, B. Expiratory reserve volume, C. Vital capacity, D. Total lung capacity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) Vital capacity', 'role': 'assistant'}]