The correct answer would be, Segregation.
Schools have often been very explicit in their efforts to stratify boys and girls. The first step towards this stratification may be the Segregation, or any time they ask students to arrange their seats or line up according to gender, teachers may be asserting that boys and girls should be treated differently.
Explanation:
When someone or something is set apart from another thing or person, it is called as Segregation. When things or people are separated from one another on the basis of any criteria, this is called as segregation.
It is true that when children reach their school age, then schools play an explicit role to stratify boys and girls.
Boys and girls are arranged on their seats or line up in the assembly according to their gender. Also, girls are encouraged to take home economics, arts, etc, whereas boys are encouraged to take math, shop, science courses. This is called as segregation.
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