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.

Steel : Utensils

B.

Bronze : Statue

C.

Duralumin : Aircraft

D.

Iron : Rails

Correct answer is D

In all other pairs, first is the alloy used to make the second. (Iron is not an alloy but a metal.)