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: Anatomy
[{'content': 'Onion peel appearance in X-ray suggests \nSelect and explain. \nA. Osteogenic sarcoma, B. Ewings sarcoma, C. Osteoclastoma, D. Chondrosarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Onion peel appearancne Typical of ---Ewings sarcoma May also be seen in ----Osteosarcoma and osteomyelitis Refer Campbell 13th/e p 953', 'role': 'assistant'}]