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': 'Malignant hypeension causes- \nSelect and explain. \nA. Flea bitten kidney, B. Irregular granular contracted kidney, C. Large white kidney, D. No change in kidney', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Malignant nephrosclerosis 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. Histology: Fibrinoid necrosis and onion-skinning of aerioles. Fibrinoid necrosis of aerioles 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'}]