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': "Libman Sach's endocarditis is associated with - \nSelect and explain. \nA. Rheumatic heart disease, B. SLE, C. Carcinoma, D. None", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]