单项选择题

A1/A2型题 下列哪种体液因子对造血起到抑制作用()

A.类胰岛素生长因子(insulin-likegrowthfactor,IGF.
B.干扰素α(interferon-α)
C.集落刺激因子(colonystimulatingfactor,CSF.
D.血小板生成素(thrombopoietin,TPO)
E.干细胞因子(SCF.