【名词&注释】
肘关节(elbow joint)、血清胆红素(serum bilirubin)、腕关节(wrist joint)、胆红素浓度(bilirubin concentration)
[单选题]当血清胆红素浓度(bilirubin concentration)高于下列哪项指标时,临床上即可见明显的黄疸( )
A. 1.7μmol/L B. 3.4μmol/L C. 34.4μmol/L D. 17.1μmol/L E. 30.4μmol/L