1. 

In the following question, a word has been given, followed by four other words, one of which cannot be formed by using the letters from the given word. Find that word.

COMMUNICATION
A. ACTION
B. UNION
C. NATION
D. UNISON

Answer: Option D

Explanation:

By using the letters of given word, 'UNISON' cannot be formed because letter 'S' is not present in the given word.