单项选择题

A.RNA聚合酶核心酶-DNA-pppGpN′-OH
B.RNA聚合酶核心酶-DNA-引物-pppGpN′-OH
C.RNA聚合酶全酶-DNA-引物-pppGpN′-OH
D.RNA聚合酶全酶-DNA-pppGpN′-OH
E.亚基-DNA-pppGpN′-OH