This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
[{'content': 'After undergoing a partial cystectomy for carcinoma of the rectum, a 76-year-old woman develops a vesicovaginal fistula. The repair will have a higher chance of success if which of the following occurs? \nSelect and explain. \nA. Scare tissue is not excised, B. The bladder wall is closed under tension, C. Repair is performed more than 6 months after the causative operation, D. Repair is performed within 7-14 days of the onset of symptoms', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Repair of vesicovaginal fistula is recommended after enough time has passed, to allow a reduction in the inflammatory reaction and even spontaneous closure to occur. To promote spontaneous closure, a Foley catheter is inserted for bladder drainage. It is advised to perform meticulous repair, excision of previous fistulous tract, and tension-free anastomosis. Frequently an omental interposition helps to separate overlapping suture lines.', 'role': 'assistant'}]