This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Giant Cell Tumor (GCT) or Osteoclastoma, Subject name: Orthopaedics
[{'content': 'Which of the following is epiphyseal tumor - \nSelect and explain. \nA. Giant cell tumor, B. Osteogenic Sarcoma, C. Ewing Sarcoma, D. Osteoidosteoma.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Giant cell tumourSites of tumorsEniphvseai tumorsMetaphyseal lesionsDiaphvseal lesionso Chondroblastomao Osteogenic sarcomao Ewing sarcomao Giant cell tumor (osteoclastoma)o Unicameral (simple) bone cysto Lymphomaso Clear cell chondrosarcomao Aneurysmal bone cysto Fibrous dysplasiao Fibrous cortical defecto Adamantinomao Chondrosarcomao Histiocytosiso Osteochondromao Osteoid osteomao Enchondromao Chondromyxoid fibromao Osteoblastomaa Fibrosarcomao Fibrous cortical defecto Non ossify ing fibroma", 'role': 'assistant'}]