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': 'Chassar moir operation is done in : \nSelect and explain. \nA. VVF, B. Vesico uterine fistula, C. Urethrovaginal fistula, D. Rectovesical', 'role': 'user'}, {'content': 'Answer: A \nExplanation: VVF', 'role': 'assistant'}]