This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification of Bone Tumors, Subject name: Orthopaedics
[{'content': 'Which is not a metaphyseal tumor - \nSelect and explain. \nA. Osteosarcoma, B. Chondrosarcoma, C. Giant cell tumor, D. Aneurysmal bone cyst', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Giant cell tumorEpiphvseal tumorsMetaphyseal lesionsDiaphyseal lesionso Chondroblastomao Giant cell tumor (osteoclastoma)o Clear cell chondrosarcomao Osteogenic sarcomao Unicameral (simple) bone cysto Aneurysmal bone cysto Fibrous cortical defecto Chondrosarcomao Osteochondromao Enchondromao Osteoblastomao Ewing sarcomao Lymphomaso Fibrous dysplasiao Adamantinomao Histiocytosiso Osteoid osteomao Chondromyxoid fibromao Fibrosarcomao Fibrous cortical defecto Non ossifying fibroma", 'role': 'assistant'}]