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: Pathology
[{'content': 'Ewings sarcoma arises from: \nSelect and explain. \nA. Totipoetent cells, B. Blastemal cells, C. Neuroectodermal cells, D. Mesodermal cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ewings sarcoma is a neuro ectodermal tumor.', 'role': 'assistant'}]