可导致婴儿永久性牙齿变色的是( )。

A．红霉素

B．四环素

C．氯霉素

D．溴隐亭

E．磺胺药

A boy, age ,develops a fever and rash and is diagnosed with rubella. His mother has just given birth to a girl. Which statement by the mother best indicates that she understands the implications of rubella（）

A. "I told my husband to give my son aspirin for his fever. "

B. "I’ll ask the physician about giving the baby an immunization shot. "

C. "I know that I won’t be able to breast-feed my baby now. "

D. "I’ll call my neighbor who is 2 months pregnant and tell her not to have contact with my son.