This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
Which vasculitis affects both aerial and venous system 
Select and explain. 
A. Wegeners granulomatosus, B. PAN, C. Behcets disease, D. Kawsaki disease
A: Wegeners granulomatosus
Answer: A: Wegeners granulomatosus 
Explanation: Small vessel vasculitis affects aerioles, capillaries and venules. Of the options given, the only small vessel vasculitis is Wegener granulomatosis. (Ref: Robbins 8/e p511)