This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Which is the most stable suture layer in all sections of the gastrointestinal tract? 
Select and explain. 
A. Mucosa, B. Submucosa, C. Muscularis, D. Serosa
B: Submucosa
Answer: B: Submucosa 
Explanation: Submucosa layer, because of its high collagen content and is the most stable suture layer in all sections of the gastrointestinal tract. Ref: Bailey and Love 27e pg: 98