Classification - Verbal and Reasoning

Directions to SolveIn each of the following questions, certain pairs of words are given, out of which the words in all pairs except one, bear a certain common relationship. Choose the pair in which the words are differently related.
Q1:

Choose the pair in which the words are differently related from the rest.

A Mercury: Sun

B Moon : Earth

C Star : Galaxy

D Wheel: Axle

ANS:C - Star : Galaxy

Explanation: In all other pairs, first moves about the second.