This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Commonest cause of ureteric injury during surgical operation is 
Select and explain. 
A. Abdomino-perineal resection, B. Hysterectomy, C. Prostectomy, D. Colectomy
B: Hysterectomy
Answer: B: Hysterectomy 
Explanation: Surgical trauma during pelvic surgery is the most common cause of ureteric trauma This occurs most often during vaginal or abdominal hysterectomy when the ureter is mistakenly divided, ligated, crushed or excised. Pre-emptive ureteric catheterisation makes it easier to identify the ureters. ( ref : Bailey 27th ed , chap 76 , pg no 1415 )