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
Most common site for endometriosis in urinary system is 
Select and explain. 
A. Kidney, B. Ureter - lower segment, C. Bladder, D. Ureter - upper segment
C: Bladder
Answer: C: Bladder 
Explanation: Bladder is most common site for urinary endometriosis.