Direction.
In these questions, two words will be given to you, and these two words will have some kind of a relationship which relates them in a particular way. After finding this relationship, you have to pick the right option which has words related in a similar way:
ACTION : REACTION : :
Introvert : Extrovert
Assail : Defend
Diseased : Treatment
Death : Rebirth
Correct Answer :
B. Assail : Defend
Reaction is in response to an action just as a defence is in response to an assail. All other pairs have a different relationship.