Correct Answer: SALUTE

Solution : Given:
CONSULTATION

Now, let's compare all the option words with the word CONSULTATION –
First option: CONSTANT; All the letters of CONSTANT ​​​​​ are present in the word CONSULTATION .
Second option: NATION; All the letters of NATION are present in the word CONSULTATION .
Third option: SALUTE; All the letters of SALUTE are not present in the word CONSULTATION as E is not present in the given word CONSULTATION.
Fourth option: STATION; All the letters of STATION are present in the word CONSULTATION .

So, from the above, only SALUTE cannot be formed using the letters of the word CONSULTATION. Hence, the third option is correct.