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: Surgery
[{'content': 'Ewings sarcoma clinically mimics ? \nSelect and explain. \nA. Osteomyelitis, B. Osteochondroses, C. Osteosclerosis, D. Heterotopic ossification', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Osteomyelitis Ewing sarcoma is one of the differential diagnosis for subacute osteomyelitis. (see following table)", 'role': 'assistant'}]