EduGoog
Choose or find odd pair of words

(Saw : Wood) , (Pen : Paper) , (Author : Book) , (Chalk : Blackboard)

Option:
A. Saw : Wood
B. Pen : Paper
C. Author : Book
D. Chalk : Blackboard
Answer: C . Author : Book

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

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