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
[{'content': 'A case of obstructed labour which was delivered by caesarian section complains of cyclical passage of menstrual blood in urine. Which is the most likely site of fistula? \nSelect and explain. \nA. Urethrovaginal, B. Vesico-vaginal, C. Vesico-uterine, D. Uretero uterine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Women with vesicocervical or vesicouterine fistula may present with cyclical hematuria at the time of mensuration. Classically fistulae is present between 5-10 days after direct surgical injury such as cesarian section as in this clinical scenario. Ref: Obstetrics and Gynaecology By Sarabatnam Arulkumaran, Page 634 ; Textbook of Gynecology By DC Dutta, 4th Edition, Pages 386-7', 'role': 'assistant'}]