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': 'Ureterovaginal fistula should best be treated by: \nSelect and explain. \nA. Ureteroneocystostomy, B. End-to-end anastomosis through an ureteric catheter, C. Implantation into colon, D. Heal conduit', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Surgeries for ureteric fistula:\n\nBladder flap procedure (modified Boari-Ocker-Blad)\nUreteroneocystostomy\nImplantation into the bladder\nNote: End to end anastomosis may lead to stricture formation.\nColonic transplantation results in recurrent pyelonephritis and hyperchloremic acidosis.', 'role': 'assistant'}]