78.成人病患，血色素 5.4 g/dL，MCV 103 fL，尿液顏色暗色。Direct anti-globulin test：IgG(陽性)、 C3d(弱陽性)，血液抹片出現許多 micro-spherocytes(如箭號所指)。下列何者為病人最可能的臨床診斷？ (A)cold agglutinin disease (B)hemolytic uremic syndrome (C)warm autoimmune hemolytic syndrome (D)thrombotic thrombocytopenic purpura