This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
ANCA positive vasculitis - 
Select and explain. 
A. Henoch schonlein purpura, B. Behcet's syndrome, C. Wegener's granulomatosis, D. None
C: Wegener's granulomatosis
Answer: C: Wegener's granulomatosis 
Explanation: Ans. (c) Wegener's granulomatosis(Ref: Robbins 9th/pg 507, Harrison 18thed p-2786-87)Option a and b are immune-mediated small-vessel systemic vasculitis. C-ANCA positive vasculitis