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': 'Pathogenic feature of malignant hypeension is \nSelect and explain. \nA. Fibrinoid necrosis, B. Papillary necrosis, C. Hard exudate, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fibrinoid necrosis is a specific pattern of irreversible, uncontrolled cell death that occurs when antigen-antibody complexes are deposited in the walls of blood vessels along with fibrin. It is common in the immune-mediated vasculitides which are a result of type III hypersensitivity. Fibrinoid is limited to small blood vessels. Typically, it involves small aeries, . The walls of necrotic vessels or glomeruli are impregnated with Refer robbins 9/e p939', 'role': 'assistant'}]