This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sterilisation surgeries, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common site of ligation by laparoscopic ring in Female sterilization: \nSelect and explain. \nA. Fimbrial, B. Cornual, C. Ampullary, D. Isthmus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common site of ligation by Falope ring in Female sterilization is Isthmus. Since isthmus has a uniform diameter and wall thickness, reversal procedures are also relatively more efficient', 'role': 'assistant'}]