This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
[{'content': 'Which of the following disease show fibrinoid necrosis? \nSelect and explain. \nA. Tuberculosis, B. Vasculitis, C. Abscess, D. Pancreatitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fibrinoid necrosis is a special form of necrosis usually seen in immune reactions involving blood vessels. This pattern of necrosis typically occurs when complexes of antigens and anti- bodies are deposited in the walls of aeries. Deposits of these "immune complexes," together with fibrin that has leaked out of vessels, result in a bright pink and amorphous appearance in H&E stains, called "fibrinoid" (fibrin-like) by pathologists', 'role': 'assistant'}]