This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
The layer responsible for the strength of an intestinal anastomosis is 
Select and explain. 
A. Mucosa, B. Submucosa, C. Muscularis propria, D. Serosa
B: Submucosa
Answer: B: Submucosa 
Explanation: Mechanical propeiesThe mechanical propeies of intact intestine in axial and transversal directions were different. The mechanical strength of the intact intestinal wall was conditioned by the submucosa and muscularis, while the serosa and mucosa showed no significant strength. Comparison of axial specimens&; mechanical propeies of the intact intestinal wall and intestinal wall with all layers sutured through determined that only the submucosa supplies mechanical strength to anastomosis.Other layers contribute no significant force to anastomotic strength. The strength applied to the thread during knot tying does not change the paicipation of the intestinal layers in supplying suture-holding capacity for 8 and 12 mm stitch depth. (Refer: