溶原性转换能使宿主菌发生（）

A.自溶作用

B.溶血作用

C.被噬菌体溶解

D.噬菌体的释放

E.毒力与抗原性变异

He had to take the medicine three times a day, so as to be _____ the pain in the leg. [ ]

A. far from    

B. away from      

C. apart from    

D. free from