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: Pathology
Bilateral contracted kidney occurs in all except 
Select and explain. 
A. Diabetes mellitus, B. Benign nephrosclerosis, C. Chronic pyelonephritis, D. Chronic glomerular nephritis
A: Diabetes mellitus
Answer: A: Diabetes mellitus 
Explanation: None