— Did you read today's newspaper?— Yes,I did. There is . Do you want to know it?
已知函数f（x）= 2x +alnx﹣2，曲线y=f（x）在点P（1，f（1））处的切线与直线y=x+3垂直．
反应如下表，据此判断激素a、b、c的化学名称依次是 
c激素