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
Which is not a Radiosensitive tumor: 
Select and explain. 
A. Lymphoma, B. Seminoma, C. Melanoma, D. Multiple myeloma
C: Melanoma
Answer: C: Melanoma 
Explanation: Melanoma is highly resistant.