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': "Kussumaul's sign is most commonly seen in \nSelect and explain. \nA. Restrictive cardiomyopathy, B. Pericardial tamponade, C. Constrictive pericarditis, D. Right ventricular infarct", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]