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
The following tumours of skin are radiosensitive, except: 
Select and explain. 
A. Cutaneous lymphoma, B. Basal cell carcinoma, C. Malignant melanoma, D. Squamous cell carcinoma
C: Malignant melanoma
Answer: C: Malignant melanoma 
Explanation: Ans. Malignant melanoma