This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: GIT 1, Subject name: Anatomy
[{'content': 'Ureteric constrictions are at all sites EXCEPT: \nSelect and explain. \nA. Pelvi-ureteric junction, B. Lesser pelvis, C. Ischial spine, D. Urinary bladder wall', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lesser pelvis is a vague option and does not specify a precise location. Ureter has five constrictions in its course: Pelvi-ureteric junction (tip of transverse process of veebra, radiologically) Pelvic brim (sacro-iliac joint radiologically) At vas deferens At Ureterovesical junction (ischial spine, radiologically) Opening at trigone.', 'role': 'assistant'}]