This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
[{'content': 'Pauci immune glomerulonephritis is seen in- \nSelect and explain. \nA. After transplant in Alpos, B. Microscopic polyangitis, C. Henoch-schonlein nephritis, D. Lupus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pauci-immune type crescentic GN is defined by the lack of anti-GBM antibodies or significant immune complex deposition. Anti-neutrophil cytoplasmic antibodies (ANCA) typically are found in the serum, which, have a pathogenic role in some vasculitides. In some instances, therefore, crescentic GN is a component of systemic vasculitis such as microscopic polyangiitis or granulomatosis with polyangiitis. Ref: ROBBINS BASIC PATHOLOGY 10th ed Pg no: 563', 'role': 'assistant'}]