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': "Onion peel appearance in X-ray suggests- \nSelect and explain. \nA. Osteogenic sarcoma, B. Ewing's sarcoma, C. Osteoclastoma, D. Chondrosarcoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Onion - peel appearance\n\n\nTypical of → \xa0Ewing's sarcoma\nMay also be seen in → Osteosarcoma and osteomyelitis.", 'role': 'assistant'}]