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: Ans. is 'b' i.e., Microscopic polyangitis