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: Anatomy
[{'content': 'The commonest site of surgical uretero-vaginal fistula is: \nSelect and explain. \nA. Below infudibulopelvic ligament, B. Below uterine aery in the mackenrodts ligament, C. Vaginal angle, D. Above uterine aery', 'role': 'user'}, {'content': "Answer: B \nExplanation: B. i.e. Below uterine aery in Mackenrodt's ligament Maximum chances of ureteric injury is in hysterectomy while ligating uterine vessels in mackenrodt's ligament Ureter is also vulnerable to injury when ovarian vessels are being ligated during ovariectomy.", 'role': 'assistant'}]