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: Radiology
[{'content': 'The most chemoresistant tumor amongst the following: \nSelect and explain. \nA. Synol sarcoma, B. Malignant fibrous histiocytoma, C. Osteosarcoma, D. Clear cell sarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Malignant fibrous histiocytoma', 'role': 'assistant'}]