This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
ANCA is positive in 
Select and explain. 
A. Wegener's granulomatosis, B. Churg strauss syndrome, C. Microscopic PAN, D. All
D: All
Answer: D: All 
Explanation: Ref - Researchgate.net