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': 'Pathogenesis of all of the following is granulomatous, except \nSelect and explain. \nA. Wegener’s granulomatosis, B. Microscopic polyangiitis, C. Takayasu’s arteritis, D. Buerger’s disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Robbins clearly mentions that “microscopic polyangiitis is characterized by segmental fibrinoid necrosis of the media with focal transmural necrotizing lesions; granulomatous inflammation is absent”.', 'role': 'assistant'}]