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
Not a cause of granular contracted kidney-. 
Select and explain. 
A. Diabetes mellitis, B. Chronic pyelonephritis, C. Benign nephrosclerosis, D. Chronic glomerulonephritis
A: Diabetes mellitis
Answer: A: Diabetes mellitis 
Explanation: Answer is A (Diabetes mellitus): Diabetes Mellitus is not associated with contracted (small) kidneys. The kidneys are typically normal or increased in size in diabetic nephropathy - Harrisons Causes of Contracted Kidneys Chronic Glonterulonephritis (Bilateral) Nephrosclerosis because of systemic hypeension (Bilateral) Chronic pvelonephritis (Usually unilateral) Global renal infarction (Unilateral) Radiation nephritis (Unilateral) Renal aery stenosis (Unilateral) Post obstructive atrophy (Unilateral) Note that Acute Gloinerulonephritis, and acute pvelonephritis are associated with enlarged kidneys but chronic cases are associated with contracted kidneys