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 narrowest pa of the ureter is at the: \nSelect and explain. \nA. Uretero - pelvic junction, B. Hiac vessel crossing, C. Pelvic ureter, D. Uretero - vesicle junction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Uretero - vesicle junctionAt the level of ischial spine ureter changes its direction from down-backward to forward - medially but there is no constriction. The narrowest pa of ureter is uretero- vesicle junctions', 'role': 'assistant'}]