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
Pathogenesis of all of the following is granulomatous, except 
Select and explain. 
A. Wegener’s granulomatosis, B. Microscopic polyangiitis, C. Takayasu’s arteritis, D. Buerger’s disease
B: Microscopic polyangiitis
Answer: B: Microscopic polyangiitis 
Explanation: Robbins clearly mentions that “microscopic polyangiitis is characterized by segmental fibrinoid necrosis of the media with focal transmural necrotizing lesions; granulomatous inflammation is absent”.