This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pathology
[{'content': 'The most characteristic histological finding of acute rheumatic carditis is:(1989) \nSelect and explain. \nA. Fibrinous pericarditis, B. Vegetations on mitral valve leaflets, C. Aschoff bodies in myocardium, D. Increased vascularity of the valves', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (Aschoff bodies in myocardium)Ref: Chandrasoma Taylor, 3rd ed, p. 347', 'role': 'assistant'}]