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: Surgery
The narrowest part of the ureter is at the 
Select and explain. 
A. Uretero-pelvic junction, B. Iliac vessel crossing, C. Pelvic ureter, D. Uretero-vesical junction
D: Uretero-vesical junction
Answer: D: Uretero-vesical junction 
Explanation: None