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': 'Classical technique of genitourinary fistula repair in contrast to Latzko technique involves \nSelect and explain. \nA. Partial excision of fistula., B. Total excision of fistulous tract., C. Shortening of vagina., D. Approximates anterior and posterior vaginal walls.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Classical technique of fistula repair involves complete excision of fistulous tract.', 'role': 'assistant'}]