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': 'Chassarmoir surgery is done is case of: \nSelect and explain. \nA. Uterine inversion, B. VVF repair, C. Ureterovesical fistula repair, D. Retroverted uterus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]