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': "Which of the following is a radio-resistant tumor? \nSelect and explain. \nA. Ewing's sarcoma, B. Malignant fibrous histiocytoma, C. Seminoma, D. Dysgerminoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Malignant fibrous histiocytoma is a soft tissue sarcoma. 10% of it occur in the head and neck. It mostly occur in adults 50-60 years of age. It has poor prognosis. Has high rate of recurrence following surgery. It is radioresistant and does not respond to chemotherapy.', 'role': 'assistant'}]