This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
The characteristic feature of benign nephrosclerosis is 
Select and explain. 
A. Leather grain appearance, B. Flea bitten kidney, C. Onion skin appearance, D. Hyperplastic aeriosclerosis
A: Leather grain appearance
Answer: A: Leather grain appearance 
Explanation: Benign nephrosclerosis Malignant nephrosclerosisAge group Elderly Younger individuals Gross Grain leather appearance-Fine granularity over coical surfaceFlea bitten appearance-Pinpoint petechial hemorrhage over coical surfaceMicroscopyHyaline aeriosclerosis, subcapsular scars Fibrinoid necrosis and onion skinning appearance of aeriolesClinical features Mild proteinuria. GFR normal Renal failure, BP >200/120,papilloedema, retinal hemorrhages and encephalopathy (Ref: Robbins 8/e p949)