This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
During Pomeroy's method of female sterilization, which poion of the tube is ligated? 
Select and explain. 
A. Isthmus, B. Ampullary, C. Isthmo-ampullary, D. Cornual
C: Isthmo-ampullary
Answer: C: Isthmo-ampullary 
Explanation: 2cm lateral to the uterine fundus . THE TEXTBOOK OF GYNAECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 388