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: Orthopaedics
[{'content': "Bone tumors arising from diaphysis -a) Chondrosarcomab) Ewing's tumorc) Osteoclastomad) Chondroblastoma e) Osteid osteoma \nSelect and explain. \nA. ab, B. ad, C. bc, D. be", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diaphyseal lesions : - Ewing sarcoma, Lymphomas, Fibrous dysplasia, Adamantinoma, Histiocytosis, Osteoid osteoma, Chondromyxoid fibroma, Fibrosarcoma, Fibrous cortical defect. Non ossifying fibroma', 'role': 'assistant'}]