This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Anatomy
[{'content': 'Vegetations on under surface of cusps are found in \nSelect and explain. \nA. Infective endicarditis, B. Libman sacks endocarditis, C. SABE, D. Rheumatic fever', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer robbins 9/e 562 Vegetations of libman sacks endocarditis occur on surface of cusps.both surfaces are involved but most commonly affects under surface', 'role': 'assistant'}]