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
The given procedure is used to diagnose 
Select and explain. 
A. Vesicovaginal fistula, B. Urethral diverticula, C. Stop post - partum hemorrhage, D. Pelvic organ prolapse
B: Urethral diverticula
Answer: B: Urethral diverticula 
Explanation: Trattner - double balloon catheter is used to diagnose urethral diverticula.