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
Which among the following is commonly used as a preservative for gut sutures: 
Select and explain. 
A. Isopropyl alcohol., B. Saline., C. Formocresol., D. Ethyl alcohol.
A: Isopropyl alcohol.
Answer: A: Isopropyl alcohol. 
Explanation: None