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.

SEGREGATION

A. EAGER
B. SEA
C. GATE
D. NATION

Answer: Option D

Explanation:

By using the letters of the given word, 'NATION' cannot be formed because letter 'N' is used only once.