六味地黄丸主治（）

A．肾阴亏损

B．肾阳不足

C．阴虚火旺

D．精血亏虚

E．肺肾两虚

As there was a power failure in the hospital, the doctor had to （）operation.

A.call for

B.call off

C.call on

D.cal lout