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 labor which was delivered by Cesarean section complains of cyclical passage of menstrual blood in urine. Which is the most likely site of fistula: \nSelect and explain. \nA. Uretherovaginal, B. Vesico-vaginal, C. Vesico-uterine, D. Uretero-uterine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]