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
Commonest cause for pulsion diveiculum of the urinary bladder is - 
Select and explain. 
A. Benign enlargement of prostate, B. Fibrous prostate, C. Contracure of bladder neck, D. Stricture urethra
C: Contracure of bladder neck
Answer: C: Contracure of bladder neck 
Explanation: Ans. is 'c' i.e., Contracure of bladder neck