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
Causes of non-healing of enterocutaneous fistula are all except 
Select and explain. 
A. Epithelialization of track, B. Track length >3 cm, C. Acute inflammatory disease, D. Radiation enteritis
B: Track length >3 cm
Answer: B: Track length >3 cm 
Explanation: • Enterocutaneous fistulas are most commonly iatrogenic, usually the result of a surgical misadventure.
Surgical misadventure leading to Enterocutaneous fistula :
• Anastomotic leakage.
• Injury of the bowel or blood supply.
• Laceration of the bowel by wire mesh or retention suture.