This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sutures and Anastomoses, Subject name: Surgery
What is true about the resection and anastomosis of necrotic bowel? 
Select and explain. 
A. Chromic catgut is used for anastomosis, B. Submucosa should not be in the sutures, C. Single-layer, extramucosal suture technique is preferred, D. Single-layer seromuscular suture technique is preferred
C: Single-layer, extramucosal suture technique is preferred
Answer: C: Single-layer, extramucosal suture technique is preferred 
Explanation: Single-layer, extramucosal suture technique is preferred as it causes the least tissue necrosis or luminal narrowing The extramucosal suture must include the submucosa because this has a high collagen content and is the most stable suture layer Catgut and silk have been replaced by synthetic, usually absorbable, polymers. The suture materials should be made of absorbable polymer- braided (e.g. polyglactin)/monofilament (e.g. polydioxanone)