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: Radiology
[{'content': "Which of following is not a feature of renovascular hypertension on intravenous urography - \nSelect and explain. \nA. Delayed 'wash - out' of contrast, B. Filling defect in calyces, C. Ureteral kinking, D. Normal or small sized kidney", 'role': 'user'}, {'content': 'Answer: B \nExplanation: IVU findings of renovascular hypertension are -\n\n\nDelayed or absent nephrogram\nNormal or atrophic kidney without calyceal deformity or abnormality\nUreteral kinking (in retroperitoneal fibrosis)\nRim nephrogram', 'role': 'assistant'}]