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
Persistent urachus is a risk factor for: 
Select and explain. 
A. Transitional cell ca of bladder, B. Adenocarcinoma of bladder, C. Squamous cell ca of bladder, D. Undifferentiated ca of bladder
B: Adenocarcinoma of bladder
Answer: B: Adenocarcinoma of bladder 
Explanation: Ans is 'b' i.e. Adenocarcinoma of bladder