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