This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Sterilization is commonly performed at which site of fallopian tube : \nSelect and explain. \nA. Ampulla, B. Infundibulum, C. Isthmus, D. Cornua', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. Isthmus', 'role': 'assistant'}]