This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
[{'content': 'Ewings sarcoma arises from \nSelect and explain. \nA. G cells, B. Totipotent cells, C. Neuroectodermal cells, D. Neurons', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Refer Robbins page no 8/e 1232 Ewing sarcoma is a malignant bone tumor characterized by primitive round cells without obvious differentiation. Recently, Ewing sarcoma and primitive neuroectodermal tumor (PNET) have been unified into a single category: the Ewing sarcoma family tumors (ESFT) based on shared clinical, morphologic, biochemical and molecular features (discussed later). Although PNET demonstrates more neu- roectodermal differentiation than Ewing sarcoma, the dis- tinction is not clinically significant', 'role': 'assistant'}]