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
[{'content': 'Sterile haemorrhagic cystitis is caused by ? \nSelect and explain. \nA. Busulfan, B. Ketoprofen, C. Methicillin, D. Cylclophosphamide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is `d\' i.e., Cyclophosphamide "Haemorrhagic cystitis can develop in patients receiving cyclophosphamide or ifosfamide." o Hemorrhagic cystitis due to cyclophosphamide is attributed to the presence of its metabolite ACROLEIN in urine. Other drugs causing hemorrhagic cystitis Carmustine o Extended spectrum penicillins o Vincristine Chlorambucil o Nitrogen mustard o Busulfan', 'role': 'assistant'}]