This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ecotopic Pregnancy, Subject name: Gynaecology & Obstetrics
Which Part of the fallopian tube which is most common site for female tubal sterilization? 
Select and explain. 
A. Cornua, B. Ampulla, C. Isthmus, D. Infundibulum
C: Isthmus
Answer: C: Isthmus 
Explanation: Ans. C. Isthmus* For female tubal sterilization, Isthmus is said to be the most common site. It is the part of the fallopian tube which is sealed or cut in a sterilization procedure or tubal ligation.* The mid isthmic portion of the tube is grasped in the bipolar electrocoagulation technique.Additionally, radiofrequency electric current is applied to three adjacent areas and coagulating 3cm of tube. Hulka clips are also placed across the mid-isthmus.