This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
True about Wegener's granulomatosis is 
Select and explain. 
A. Large vessel vasculitis, B. Granulomas in GBM, C. Nephrosclerosis, D. Focal necrotizing GN
D: Focal necrotizing GN
Answer: D: Focal necrotizing GN 
Explanation: Triad of WG: a. Acute necrotizing granulomas of respiratory tract b. Necrotizing or granulomatous vasculitis of small to medium-sized vessels c. Focal necrotizing often crescentic GN