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
Marion's disease is due to - 
Select and explain. 
A. Muscular hypertrophy of internal sphincter of urinary bladder, B. Fibrosis of the neck of bladder, C. Vesicular diverticula, D. Vesicular calculi
A: Muscular hypertrophy of internal sphincter of urinary bladder
Answer: A: Muscular hypertrophy of internal sphincter of urinary bladder 
Explanation: None