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
Which is the most common cause of delayed urinary tract obstruction after Trans Urethral Resection of Prostrate (TURP): 
Select and explain. 
A. Stricture of the Navicular fossa, B. Stricture of the membranous urethra, C. Stricture of the bulb of urethra, D. Bladder neck stenosis
D: Bladder neck stenosis
Answer: D: Bladder neck stenosis 
Explanation: Bladder neck stenosis is the most common cause of obstructive symptoms following Trans Urethral Resection of Prostrate (TURP). Its due to the presence of a tight membrane at the neck of the bladder. Ref: Transurethral resection By John Peter Blandy, Richard G. Notley, John Reynard, Page 190-91; Contemporary Issues in Prostate Cancer: A Nursing Perspective By Jeanne Held-Warmkessel, Page 167.