The following question, consist of two words each that have a certain relationship to each other, followed by four lettered pairs of words. Select the lettered pair that has the same relationship as the original pair of words: Quack : Duck :: Bellows : ?

The answer is C. Bull.

Quack is the sound that a duck makes. Bellows is a device that makes a bellowing sound. A bull makes a bellowing sound.

The other options are incorrect because:

• A cat does not make a sound that is similar to the sound of a bellows.
• A frog makes a croaking sound, which is not similar to the sound of a bellows.
• A fox makes a barking sound, which is not similar to the sound of a bellows.