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 of the following tumor is least sensitive to radiation? 
Select and explain. 
A. Bronchogenic carcinoma, B. Adenocarcinoma of colon, C. Malignant melanoma, D. Osteogenic sarcoma
C: Malignant melanoma
Answer: C: Malignant melanoma 
Explanation: Ans. Malignant melanoma