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
Voiding cysto urethrogram when viewed laterally, helps to diagnose all of following except 
Select and explain. 
A. Vesicovaginal fistula, B. Ureterovaginal fistula, C. Urethro vaginal fistula, D. Urethral diverticulum
B: Ureterovaginal fistula
Answer: B: Ureterovaginal fistula 
Explanation: Intra - venous pyelography is used to diagnose uretero vaginal fistula.