This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genitourinary radiology, Subject name: Radiology
[{'content': '"Swiss cheese" nephrogram on IVP is a feature of : \nSelect and explain. \nA. Acute ureteral obstruction, B. Severe hydronephrosis, C. Polycystic Kidney Disease, D. Medullary cystic disease of kidney', 'role': 'user'}, {'content': "Answer: C \nExplanation: In ADPKD, 'Swiss cheese'nephrogram is due to the presence of innumerable lucent cysts of various sizes throughout the kidneys.", 'role': 'assistant'}]