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': 'Flat vegetations in pockets of valves are due to : \nSelect and explain. \nA. Rheumatic hea disease, B. Libman sacks Endocarditis, C. NBTE, D. Infective endocarditis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Libman sach's Endocarditis) Flat vegetation in pockets of valves are charachteristic of Libman sach's endocarditis", 'role': 'assistant'}]