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
Which one of the following is used as preservative for packing catgut suture 
Select and explain. 
A. Isopropyl alcohol., B. Colloidal iodine., C. Glutaraldehyde., D. Hydrogen peroxide.
A: Isopropyl alcohol.
Answer: A: Isopropyl alcohol. 
Explanation: Ans. is 'a' ie., isopropyl alcoholRememberSuturesPreservatives usedCatgutIsopropyl alcoholProlineIsopropyl alcoholVicrylNoneSilkNone