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': 'Normal inspiratory reserve volume (IRV) is ? \nSelect and explain. \nA. 500 ml, B. 1200 ml, C. 3000 ml, D. 4900 ml', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 3000 ml(Ref: Ganong 24e/e p.629)", 'role': 'assistant'}]