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: 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 alcohol', 'role': 'assistant'}]