13.一位47歲男性因liver cirrhosis及ascites住院，連續兩天抽腹水各2,000 mL之後，BP 94/62 mm Hg, HR 93/min, 尿量減少 (約500 mL/day), 血清 [Creatinine] 3.8 mg/dL (baseline是1.0 mg/dL), [Na] 144 mEq/L, BUN 42 mg/dL。尿液的[Creatinine] 38 mg/dL, urine [Na] 48 mEq/L. 此病人的腎功能惡化，最可能原因是發生:
(A)Acute Interstitial Nephritis
(B)Acute Tubular Necrosis
(C)Acute Glomerulonephritis
(D)Hepato-renal Syndrome
(E)Pre-renal Azotemia