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: Pharmacology
Which of the following is a radioprotector ? 
Select and explain. 
A. Colony stimulating factor, B. Amifostine, C. Cisplatin, D. Methotrexate
B: Amifostine
Answer: B: Amifostine 
Explanation: None