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
In intravenous pyelography, one contracted kidney indicates: 
Select and explain. 
A. Hydronephrosis, B. Polycystic kidney, C. Chronic glomerulonephritis, D. Chronic pyelonephritis
D: Chronic pyelonephritis
Answer: D: Chronic pyelonephritis 
Explanation: Ans. Chronic pyelonephritis