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
[{'content': 'Commonest cause for pulsion diveiculum of the urinary bladder is - \nSelect and explain. \nA. Benign enlargement of prostate, B. Fibrous prostate, C. Contracure of bladder neck, D. Stricture urethra', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Contracure of bladder neck", 'role': 'assistant'}]