This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
[{'content': 'Following are the signs of urinary tract obstruction in a CT Scan: \nSelect and explain. \nA. Dilated ureter, B. Perinephric fat stranding, C. Thickening of Lateroconal fascia, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) All the aboveRef Internet SourcesFeatures of CT Scan abdomen in Obstruction of Urinary system:* Ureter dilatation* Hydroureter* Hydronephrosis* Perinephric stranding* Periureteral Edema* Unilateral Renal Angiogram', 'role': 'assistant'}]