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 bone tumors produce that characteristically responds to aspirin? \nSelect and explain. \nA. Osteoma, B. Osteoid osteoma, C. Osteoblastoma, D. Osteoclastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pain in osteoid osteoma is due to PGE2 production it produces characteristic nocturnal pain and that responds to aspirin.', 'role': 'assistant'}]