5. 不明原因的急性腎損傷(AKI)，尿液檢查發現:protein (2+), RBC cast (+), WBC cast (-), WBC 0-5/HPF, eosinophil (-), bacteria (-), Muddy brown cast(-), FENa ＞ 1% 病人發生AKI最可能的病因為:
(A) Glomerulonephritis (GN) or vasculitis
(B) Interstitial nephritis
(C) Acute tubular necrosis (ATN)
(D) Pyelonephritis or papillary necrosis
(E) Renal arterial or vein occlusion