<prompt> During Pomeroys method of female sterilization, which poion of the tube is ligated ?IsthmusAmpullaryIsthmo-ampullaryCornual  <response>: Ans. is c i.e. Isthmo-ampullary I have given these 2 questions 4 and 5 simultaneously so that you understand how the answer changes as the options of the question change. Sterilization is done at the junction of proximal and middle third - the loop formed consists mainly of isthmus and pa of the ampullary region of the tube. Therefore if in options- isthmo-ampullary is given, it is the best choice but if isthmo ampullary is not given Isthmus is the next best choice. 