Which of the following is a correct pair of masculine and feminine gender?

Boar:Sow

The correct pair of masculine and feminine gender is Boar:Sow.

• Bachelor:Bachelor is not a correct pair because both words are masculine.
• Boaress is not a commonly used word, so Boar:Boaress is not a correct pair.
• Gander:Geese is not a correct pair because geese is the plural form of goose, which is a gender-neutral word.

The feminine form of boar is sow. A sow is a female pig, while a boar is a male pig. So, the pair boar:sow is a correct pair of masculine and feminine gender.