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': 'Most common type of urinary fistula is : \nSelect and explain. \nA. Uterovaginal, B. Vesicovaginal, C. Urethrovaginal, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vesicovaginal', 'role': 'assistant'}]