This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Management of Wounds, Subject name: Surgery
[{'content': 'Which one of the following is used as preservative for packing catgut suture \nSelect and explain. \nA. Isopropyl alcohol., B. Colloidal iodine., C. Glutaraldehyde., D. Hydrogen peroxide.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' ie., isopropyl alcoholRememberSuturesPreservatives usedCatgutIsopropyl alcoholProlineIsopropyl alcoholVicrylNoneSilkNone", 'role': 'assistant'}]