This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy, Subject name: Radiology
[{'content': 'Radiosensitisers are all Except \nSelect and explain. \nA. Metronidazole, B. Nimorazole, C. Cisplatin, D. Amifostine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Radiosensitisers are agents that increase the lethal effects of radiation when given during (or sholy prior) to its delivery. There are three clinically used radiosensitisers - hypoxic cell sensitisers, hypoxic cell cytotoxics and the halogenated pyrimidines - that increase the sensitivity of tumour cells with minimal effect on normal tissues. chemotherapy drugs like cisplatin, 5FU are radiosensitisers.Reference: Eric J Hall Textbook of Radiobiology for Radiologist; 5th edition', 'role': 'assistant'}]