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
All are causes of granular contracted kidneys,except- 
Select and explain. 
A. Benign nephrosclerosis, B. Diabetes mellitus, C. Chronic PN, D. Chronic GN
B: Diabetes mellitus
Answer: B: Diabetes mellitus 
Explanation: None