Question

--- Your sister isn’t a nurse, is she?
--- ______. She teaches English in a middle school.

1. A.
   No, she isn’t
2. B.
   yes, she is
3. C.
   Yes, she isn’t

Answer 1

A
英语中反义疑问句的回答只依据事实回答，B选项首字母没大写，C选项前后矛盾，故选A。