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
[{'content': 'Fibrinoid necrosis may be observed in \nSelect and explain. \nA. Malignant Hypertension, B. Polyarteritis nodosa, C. Aschoff bodies, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fibrinoid necrosis is a special form of necrosis, visible\xa0by light microscopy, usually in immune reactions in which\xa0complexes of antigens and antibodies are deposited in\xa0the walls of arteries. The deposited immune complexes,\xa0together with fibrin that has leaked out of vessels, produce\xa0a bright pink and amorphous appearance on H&E preparations\xa0called fibrinoid (fibrin-like) by pathologists', 'role': 'assistant'}]