This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Wof agent is used to prevent hemorrhagic cystitis caused by cyclophosphamide and ifosfamide \nSelect and explain. \nA. Busulfan, B. Carmustine, C. Mesna, D. Niacin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: To prevent hemorrhagic cystitis mesna is routinely given with the drugs. Mesna is a -SH compound that is excreted in urine--binds and inactivates the vasicotoxic metabolites(Acrolein) of ifosfamide and cyclophosphamide. Ref:- kd tripathi; pg num:-860', 'role': 'assistant'}]