This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'Which of the following is not a feature of renovascular hypertension on IVU? \nSelect and explain. \nA. Delayed wash out of contrast, B. Ureteral kinking, C. Filling defect in calyces, D. Normal or small sized kidney', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Filling defect in calycesFilling defect in calyces is not a feature of renovascular hypertension on IVU.IVU findings of Renal vascular hypertension are:* Delayed or absent nephrogram* Normal or atrophic kidney with atrophic deformity or abnormality* Ureteral kinking (in retroperitoneal fibrosis)* Rim Nephrogram', 'role': 'assistant'}]