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: Medicine
[{'content': 'Causes of pulsus bisferiens \nSelect and explain. \nA. LV failure, B. Cardiac tamponade, C. Hypertrophic cardiomyopathy, D. Constrictive pericarditis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pulsus bisferiens(2 systolic peaks) is seen in\n\nAortic regurgitation +/aortic stenosis\xa0\nHypertrophic cardiomyopathy', 'role': 'assistant'}]