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': "'Boari's Operation' is \nSelect and explain. \nA. Renal pelvic flap, B. Urinary diversion, C. Bladder flap, D. None", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bladder flap', 'role': 'assistant'}]