Which of the following is a 'Small Vessel Vasculitis':

Answer is B (Microscopic polyangitis): Miscroscopic Polyangitis (Microscopic Polyaeritis) is classified as 'Small Vessel Vasulitis' Polyaeritis Nodosa (PAN) is classified as 'Medium Vessel' vasculitis, while, Giant cell vasculitis(Temporal) and Takayasu disease are both classified as 'Large Vessel' vasculitides.