<prompt> ACNA is sensitive and specific for:Post streptococcal glomerulonephritisIdiopathic cresentic glomerulonephritisDiffuse glomerulosclerosisHenochs schonlein_purpura  <response>: Answer is B Idiopathic crecentric glomerulonephritis Crescentric glomerulonephritis is associated with antimyeloperoxidase antibodies. The major target for perinuclear ANCA p-ANCA is the enzyme myeloperoxidase 