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 surgery is done is a case of \nSelect and explain. \nA. Uterine inversion, B. Vesicovaginal fistula repair, C. Ureterovesical fistula repair, D. Retroverted uterus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chassar moir technique is widely used in the repair of vesicovaginal fistula.\nVagina and bladder are separated all around by flap splitting method and sutured separately in two layers.', 'role': 'assistant'}]