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
[{'content': 'Onion peeling of renal vessels is seen in- \nSelect and explain. \nA. Benign hypeension, B. Malignant hypeension, C. Diabetic nephropathy, D. SLE', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Malignant nephrosclerosis Histology: Fibrinoid necrosis and onion-skinning of aerioles. Flea-bitten kidney: It is characterized by the presence of small, pinpoints petechial hemorrhages on the coical surface due to rupture of aerioles or glomerular capillaries. Causes of the flea-bitten kidney: Malignant hypeension Subacute bacterial endocarditis Rapidly progressive GN Henoch-Schonlein purpura. Ref: RAM DAS NAYAK EXAM PREPARATORY MANUAL FOR UNDERGRADUATES 2nd ed. pg no: 621', 'role': 'assistant'}]