In the following question, 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 from the rest.

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

Correct answer is C

In all other pairs, first moves about the second.