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': 'Post MI:systolic murmur in left lower sternum may be dueto all, EXCEPT - \nSelect and explain. \nA. Complete heart block, B. Rupture of interventrictilar septum, C. Papillary muscle dysfunction, D. Ischemic:cardiorny.opathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]