This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Infarcts involving which pa of the myocardium cause aneurysm as a post-Myocardial infarction complication \nSelect and explain. \nA. Anterior transmural MI, B. Posterior transmural MI, C. Subendocardial MI, D. Inferior wall MI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: * Ventricular aneurysms are circumscribed, thinwalled fibrous, noncontractile outpouchings of the ventricle. * An aneurysm is a severely scarred poion of infarcted ventricular myocardium that does not contract normally. * A ventricular aneurysm may develop in some patients following a large MI (especially anterior). * Instead, during ventricular systole the aneurysmal poion bulges outward while the rest of the ventricle is contracting. * Ventricular aneurysms may occur on the anterior or inferior surface of the hea. Ref: Friedman BM, Dunn MI. Post infarction ventricular aneurysms. Clinical cardiology.', 'role': 'assistant'}]