This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vasculitis, Subject name: Pathology
Pathogenesis of all of the following is granulomatous inflammation, except: 
Select and explain. 
A. Wegener's granulomatosis, B. Churg-Strauss syndrome, C. Takayasu's aeritis, D. Microscopic polyangitis
D: Microscopic polyangitis
Answer: D: Microscopic polyangitis 
Explanation: Microscopic polyangitis is characterized by segmental fibrinoid necrosis of the media with focal transmural necrotizing lesions; granulomatous inflammation is absent.