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': 'Commonest complication of infective endocarditis is - \nSelect and explain. \nA. CCF, B. Embolisation, C. Regurgitation, D. Sudden death', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]