ANTI GBM antibodies
Ans: B. ANTI GBM antibodies
Immunofluorescence demonstrated linear staining with IgG, characteristic of anti-glomerular basement membrane disease, also known as Goodpasture syndrome.
Anti–glomerular basement membrane (anti-GBM) antibodies are seen in Goodpasture syndrome. They cause endothelial cell injury resulting in a nephritic syndrome with hematuria.