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 following tumours of skin are radiosensitive, except: \nSelect and explain. \nA. Cutaneous lymphoma, B. Basal cell carcinoma, C. Malignant melanoma, D. Squamous cell carcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Malignant melanoma', 'role': 'assistant'}]