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
[{'content': 'An appendicular fistula is least likely to heal if ? \nSelect and explain. \nA. The stump was sutured with vicryl, B. There is stenosis/narrowing of the sigmoid colon, C. Superadded infection, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., There is stenosis/narrowing of the sigmoid colon", 'role': 'assistant'}]