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 Saw : Wood

B Pen : Paper

C Author : Book

D Chalk : Blackboard

ANS:C - Author : Book

Explanation: In all other pairs, first is the tool which works over the second.