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
[{'content': 'Which of the following is the most common site of tubal ligation: \nSelect and explain. \nA. Ampulla, B. Isthmus, C. Interstitial, D. Fimbria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In India tubal ligation is still done by the Pomeroy operation and entry is mostly by Minilap, though Laparoscopic procedures have increased substantially. A loop is made by holding the tube by an allis forceps in such a way that the major pa of the loop consists of isthmus i.e. at the junction of proximal and middle third. Isthemic sterilization is best since , if required, a re anastomosis at the isthmo isthmic site has the best chance of success', 'role': 'assistant'}]