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: Pathology
[{'content': 'Commonest complication of prosthetic valve is ? \nSelect and explain. \nA. Embolism, B. Subacute bacterial endocarditis, C. Rejection, D. Infarction', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Embolism Thromboembolic complications are the major problem with mechanical valves.", 'role': 'assistant'}]