Choose the pair which shows the same relation as the given pair from the following options 

 BRISTLE : BRUSH 

key : piano

The answer is key : piano.

The analogy is part : whole. A bristle is a part of a brush, and a key is a part of a piano. The other options do not have the same relationship.

• Arm : leg does not have the same relationship because an arm is not a part of a leg.
• Recline : chair does not have the same relationship because recline is an action, not a part of a chair.
• Stage : curtain does not have the same relationship because a stage is not a part of a curtain.