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': 'In which of the following conditions are the Aschoff bodies observed? \nSelect and explain. \nA. Acute myelogenous leukemia, B. Pheochromocytoma, C. Osteopetrosis, D. Rheumatic fever', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aschoff bodies are the classic lesions observed in rheumatic fever. They are areas of focal necrosis surrounded by a dense inflammatory infiltration and may be observed in heart tissues.', 'role': 'assistant'}]