This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
What could be the cause of the condition given in below CT? 
Select and explain. 
A. Carcinoma colon, B. Bladder outlet obstruction, C. Diveiculosis coli, D. Ureteric stricture
B: Bladder outlet obstruction
Answer: B: Bladder outlet obstruction 
Explanation: CT abdomen is showing bilateral hydronephrosis could be a result of bladder outflow obstruction. Ureteric obstruction causes unilateral hydronephrosisRef: Bailey and Love, 27e, page: 1461