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: Pathology
[{'content': 'Vegetations in libman sacendocarditis are - \nSelect and explain. \nA. Large and fragile, B. Small way along the line of closure of valve, C. Small or medium sized on either or both sides of valve, D. Small bland vegetations', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Libman-Sacks endocarditis is characterized by the presence of sterile vegetations on the valves of patients with systemic lupus erythematosus. The lesions probably develop as a consequence of immune complex deposition and thus exhibit associated inflammation, often with fibrinoid necrosis of the valve substance adjacent to the vegetation; subsequent fibrosis and serious deformity can result in lesions that resemble chronic rheumatic hea disease. These can occur anywhere on the valve surface, on the cords, or even on the atrial or ventricular endocardium. (Robbins Basic pathology,9th edition.pg no.394)', 'role': 'assistant'}]