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
[{'content': 'What could be the cause of the condition given in below CT? \nSelect and explain. \nA. Carcinoma colon, B. Bladder outlet obstruction, C. Diveiculosis coli, D. Ureteric stricture', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]