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: Gynaecology & Obstetrics
Vesicovaginal fistula after an obstetric labour manifests after: 
Select and explain. 
A. Within 24 hours, B. Within 72 hours, C. Within 1st week, D. After 1st week
D: After 1st week
Answer: D: After 1st week 
Explanation: Vesicovaginal fistula may present days to weeks after the initial inciting surgery, and those following hysterectomy typically present at 1 to 3 weeks. It classically presents with unexplained continuous urinary leakage from the vagina after a recent operation. Other less specific symptoms of genitourinary fistula include fever, pain, ileus, and bladder irritability. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 26. Genitourinary Fistula and Urethral Diveiculum. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.