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': 'Rapid X descent unlikely in \nSelect and explain. \nA. Constrictive pericarditis, B. Cardiac tamponade, C. RVMI, D. Restrictive cardiomyopathy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Answer is C (RVMI) Rapid 'x' descent is rare in RVMI Feature Tamponade Constrictive Pericaditis Restrictive Cardiomyopathy RVMI Prominent x descent Present Usually present Present Rare Prominent y descent Absent Usually present Rare Rare", 'role': 'assistant'}]