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': 'Which of the following true about Libman sac’s endocarditis-- \nSelect and explain. \nA. It is along the line of closure, B. On either side of valve, C. It is friable, D. Organism are seen', 'role': 'user'}, {'content': "Answer: B \nExplanation: In SLE, mitral and tricuspid valvulitis with small, sterile vegetations, called LibmanSacks endocarditis is\xa0occasionally encountered.\nThe lesions are small single or multiple, sterile, granular pink vegetations ranging from 1 to 4 mm in\xa0diameter. The lesions may be located on the undersurfaces of the atrioventricular valves, on the valvular\xa0endocardium, on the cords, or on the mural endocardium of atria or ventricles.\nAn intense valvulitis may be present, characterized by fibrinoid necrosis of the valve substance that is\xa0often contiguous with the vegetation.\nSubsequent fibrosis and serious deformity can result that resembles chronic RHD and require surgery'.", 'role': 'assistant'}]