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
[{'content': "During Pomeroy's method of female sterilization, which poion of the tube is ligated? \nSelect and explain. \nA. Isthmus, B. Ampullary, C. Isthmo-ampullary, D. Cornual", 'role': 'user'}, {'content': 'Answer: C \nExplanation: 2cm lateral to the uterine fundus . THE TEXTBOOK OF GYNAECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 388', 'role': 'assistant'}]