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: Anatomy
In a survey, many children are examined and were found to have urogenital abnormalities. Which congenital anomaly is associated with an increased risk of bladder carcinoma ? 
Select and explain. 
A. Medullary sponge kidney, B. Double ureter, C. Unilateral renal agensis, D. Bladder exstrophy
D: Bladder exstrophy
Answer: D: Bladder exstrophy 
Explanation: Congenital anomalies associated with an increased risk of bladder cancer are: patent urachus exstrophy bladder Both increase the risk for adenocarcinoma.