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
ANCA positive vasculitis 
Select and explain. 
A. Henoch schonlein purpura, B. Behcet's syndrome, C. Wegener's granulomatosis, D. All
C: Wegener's granulomatosis
Answer: C: Wegener's granulomatosis 
Explanation: Ans. is 'c' i.e., Wegener's granulomatosis