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
The surgeon who introduced catgut in surgery was ? 
Select and explain. 
A. Astley Cooper, B. Lord Lister, C. John Hunter, D. Syme
C: John Hunter
Answer: C: John Hunter 
Explanation: Ans. is 'c' i.e., John Hunter