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.

Dog : Bitch :: ?

Cock : Hen 

Dog : Bitch :: ?

The logic;

(Left side word represent male and right side is female of the same species)

=> Cock : Hen, these are the male and female terms for chickens, so this fits the logic.