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
[{'content': 'Radioprotective drug is – \nSelect and explain. \nA. Paclitaxem, B. Vincristine, C. Amifostine, D. Etoposide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Amifostine (WR - 2721) is one of today's most widely studied radioprotector.", 'role': 'assistant'}]