This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
Which compound is not considered as a radiosensitizer? 
Select and explain. 
A. Hyperbaric oxygen, B. Misonidazole, C. Amifostine, D. Idoxuridine
C: Amifostine
Answer: C: Amifostine 
Explanation: Ans. C. AmifostineMany thiol groups of compounds like amifostine are used to protect normal cells from the harmful side effects of radiation. The agent amifostine is used commonly in clinical practice to protect from toxicities of Chemoradiotherapy.