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: Medicine
All of the following are causes of granular contracted kidney except: 
Select and explain. 
A. Benign nephrosclerosis, B. Chronic pylonephritis, C. Diabetes mellitus, D. Chronic glomerulonephritis
C: Diabetes mellitus
Answer: C: Diabetes mellitus 
Explanation: Answer is C (Diabetes Mellitus): The kidneys are typically normal or increased in size in diabetic nephropathy - Harrison 14th / 1546, 15th/1590 Most forms of chronic renal insufficiencies lead to shrinkage or decrease in size of the kidney. Notable exceptions, wherein kidney size is usually normal or increases include : Diabetic nephropathy Q Amyloidosis Q Polycystic kidney disease Q Kidney is contracted/shrunken in the remaining three conditions - Benign nephrosclerosis Q - Chronic pyelonephritis Q - Chronic glomerulonephritis Q