This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
[{'content': "Which bone tumor appears in epiphysis? \nSelect and explain. \nA. Osteoclastoma, B. Ewing's sarcoma, C. Chondromyxoid fibroma, D. Osteosarcoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Osteoclastoma a.k.a Giant cell tumor Occurs at the epiphysis Tumors occurring at epiphysis: Chondroblastoma Osteoclastoma Metaphysis: Osteosarcoma Enchondroma Chondrosarcoma Simple bone cyst Aneurysmal bone cyst Diaphysis (LEMON) Lymphoma Ewing&;s sarcoma Multiple myeloma Osteoid osteoma Admantinoma Ref: Maheshwari 9ED pg 250.', 'role': 'assistant'}]