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': 'Variant of Giant cell tumor is? \nSelect and explain. \nA. Ossifying fibroma, B. Non ossifying fibroma, C. Osteosarcoma, D. Chondroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chondroblastoma [Ref This is the best we could find, after long hours of search. "A chondroblastoma is a rare, usually benign, tumor of bone that accounts .for approximately I% of all bone tumors. In 1931, Cadman classified it as a chondromatous variant of giant cell tumors, when he described these lesions in the proximal humerus. A decade later, Jaffe and Lichtenstein renamed the Codman tumor a benign chondroblastoma to emphasize the chondroblastic genesis of the lesion and to distinguish it .from the classic giant cell tumor of bone."- emedicine.inedscape.com', 'role': 'assistant'}]