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': 'Which of the following is true about Libman sacks 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: None', 'role': 'assistant'}]