49.血液中非結合型膽紅素(unconjugated bilirubin)之濃度上升，最有可能是下列何種疾病？ (A)肝硬化(liver cirrhosis) (B)膽道阻塞(biliary obstruction) (C)溶血性貧血(hemolytic anemia) (D)威爾森病(Wilson disease)