<prompt> Crescents on histopathologic examination of glomerulus are seen inMinimal change diseaseRapidly proliferative GNMembranous glomerulonephritisMPGN  <response>: Ans. b RPGN. Ref. Robbin, Pathology 8th ed., 545Rapidly Progressive Crescentic Glomerulonephritis RPGN is a clinical syndrome and not a specific etiologic form of GN. Clinically, it is characterized by rapid and progressive loss of renal function with features of the nephritic syndrome, often with severe oliguria and if untreated death from renal failure within weeks to months. Regardless of the cause, the histologic picture is characterized by the presence of crescents crescentic GN. These are produced in part by proliferation of the parietal epithelial cells of Bowmans capsule in response to injury and in part by infiltration of monocytes and macrophages.Type I Anti-GBM AntibodyIdiopathicGoodpasture syndromeType II Immune ComplexIdiopathicPostinfectiousinfection relatedSystemic lupus erythematosusHenoch-Schonlein purpuraIgA nephropathyType III Pauci-Immune ANC A AssociatedIdiopathicWegener granulomatosisMicroscopic angiitis 