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': 'Which is not a Radiosensitive tumor: \nSelect and explain. \nA. Lymphoma, B. Seminoma, C. Melanoma, D. Multiple myeloma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Melanoma is highly resistant.', 'role': 'assistant'}]