This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'A patient develops Mitral Regurgitation following myocardial infarction. The likely cause for this complication is \nSelect and explain. \nA. Infarction involving the valve, B. Rupture of chorda tendinae, C. Dilatation of the ventricle, D. Atrial fibrillation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Rupture of chorda tendinae # MR is frequently secondary to ischemia.> Thus, it may occur as a consequence of ventricular remodeling or with fibrosis of a papillary muscle in patients with healed myocardial infarction.> It may develop acutely in patients with acute infarction involving the base of a papillary muscle.', 'role': 'assistant'}]