题目内容：
When may a woman start her nevirapine-based treatment if she gets the single dose of nevirapine at delivery?
A．She may start nevirapine-based treatment soon after her delivery. B．She may start nevirapine-based treatment within six months after her delivery.
C．She has to wait at least six months after that nevirapine exposure.
D．She may wait several years so as to achieve the best effect.
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答案解析：