单项选择题

A1/A2型题 某病人血肌酐88.4μmol/L,尿肌酐浓度4420μmol/L,24h尿量为1584ml,其内生肌酐清除率CCr为()

A.25ml/min
B.50ml/min
C.55ml/min
D.75ml/min
E.155ml/min