【单选题】A 25-year-old man has a 5-year history of celiac sprue. Several days after a mild upper respiratory infection, he begins passing dark red-brown urine. The dark urine persists for the next 3days and th...
A.
Subepithelial electron-dense deposits
B.
Granular staining of the basement membrane by anti-IgG antibodies
C.
Mesangial lgA staining by immunofluorescence
D.
Diffuse proliferation and basement membrane thickening