Final answer:
The nation that separates males and females in schools is Iran, primarily at the post-secondary level.
Explanation:
Iran is the nation that separates males and females in schools. This practice is seen particularly in the post-secondary or tertiary level of education, with policies aimed at maintaining gender segregation.
Gender separation in education has been a topic of debate, with some arguing that single-sex classes can provide benefits, while others emphasize the importance of gender equality in all educational settings.
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