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
Most common site of ligation by laparoscopic ring in Female sterilization: 
Select and explain. 
A. Fimbrial, B. Cornual, C. Ampullary, D. Isthmus
D: Isthmus
Answer: D: Isthmus 
Explanation: 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