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
[{'content': "Which of the following conditions are associated with paucity - immune crescentic glomerulonephritis? \nSelect and explain. \nA. Henoch - Schonlein Nephritis, B. Lupus Nephritis (SLE), C. Microscopic polyangitis, D. Nephritis in Alpo's syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Microscopic polyangiitis is an ill-defined autoimmune disease characterized by a systemic, pauci-immune, necrotizing, small-vessel vasculitis without clinical or pathological evidence of necrotizing granulomatous inflammation. It is type III Rapidly progressive glomerulonephritis (RPGN). Around 90% patient s will have P-ANCA positive. Ref: Emil A. Tanagho, Jack W. McAninch (2004), Chapter 31, "Diagnosis of Medical Renal Diseases", In the book, "Smith\'s General Urology", USA, Page 523; Robbin\'s Basic Pathology, 7th Edition, Page 977', 'role': 'assistant'}]