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
All of the following are small vessel vasculitis, Except: 
Select and explain. 
A. Wegner's granulomatosis, B. Microscopic polyangitis, C. Polyaeritis Nodosa, D. Henoch-Schonelin purpura
C: Polyaeritis Nodosa
Answer: C: Polyaeritis Nodosa 
Explanation: Answer is C (Polyoeritis Nodosa):Classic Polyaeritis nodosa does not involve capillaries and venules and is classified as a medium vessel vasculitis.Micorscopic polyangitis (Microscopic PAN),Wegener's granulomatosis and Henoch Scholein purpura are all classified as small vessel vasculitis.