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
Which of the following is Type III RPGN 
Select and explain. 
A. SLE, B. IgA nephropathy, C. Granulomatosis with polyangitis, D. Cryoglobulinemia
C: Granulomatosis with polyangitis
Answer: C: Granulomatosis with polyangitis 
Explanation: Type III RPGN is the most common type of RPGN. It is "pauci immune type". It doesn't have either anti-GBM antibodies or immune complexes. It is ANCA associated hence the examples are Granulomatosis with polyangitis, microscopic polyangitis.