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': 'What is radioresistant – \nSelect and explain. \nA. Cartilage, B. Seminoma, C. Ewings sarcoma, D. GI epithelium', 'role': 'user'}, {'content': "Answer: A \nExplanation: Bone & cartilage are radioresistant.\nEwing's sarcoma, seminoma and GI epithelium are highly radiosensitive.", 'role': 'assistant'}]