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 most likely cause for suture leak after colon resection and anastomosis for cancer sigmoid is ? 
Select and explain. 
A. Subclinical malnutrition, B. Infection of anastomotic site, C. Mechanical disruption due to colonic pressure and contractility, D. Ischaemia
D: Ischaemia
Answer: D: Ischaemia 
Explanation: Ans. is 'd' i.e., Ischaemia