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': 'Which of the following malignancy is a variant of Giant cell tumor? \nSelect and explain. \nA. Ossifying fibroma, B. Non ossifying fibroma, C. Osteosarcoma, D. Chondroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: "A chondroblastoma is a rare, usually benign, tumor of bone that accounts for approximately 1% of all bone tumor. In 1931, Codman classified it as a chondromatous variant of giant cell tumors, when he described these lesions in proximal humerus. A decade later, Jaffe and Lichtenstein renamed the Codman tumor a benign chondroblastoma emphasizng the chondroblastic genesis of the lesion and to distinguish it from the classic giant cell tumor of bone.', 'role': 'assistant'}]