Words given on the left side of (::) are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation.

Horse : Mare :: ?

Brother : Sister

Horse : Mare :: ?

The logic followed here is :.

THE OPPOSITE GENDER OF HORSE IS MARE

HORSE IS MASCULINE GENDER

MARE IS FEMININE GENDER

SIMILARLY

THE OPPOSITE OF BROTHER IS SISTER

BROTHER IS MASCULINE GENDER

SISTER IS FEMININE GENDER