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: Surgery
[{'content': 'Epiphyseal arising bone tumor is: \nSelect and explain. \nA. Osteod osteoma, B. Chondrosarcoma, C. Ewings sarcoma, D. Chondroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chondroblastoma', 'role': 'assistant'}]