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
"Pauci immune" glomerulonephritis is seen in: 
Select and explain. 
A. After transplant in Alpos, B. Microscopic polyangitis, C. Henoch-Schonlein nephritis, D. Lupus
B: Microscopic polyangitis
Answer: B: Microscopic polyangitis 
Explanation: Microscopic polyangitis