Hello aspirant,

NTA gives option for challenge answer key,and it is beneficial foer all aspirants.When talking about challenge you should be confident if you are asking for a valid correction.Answer key is to check that your choose options are right.

Hope it helps.

Hello student, 

NTA provides an option for answer key challenge to ensure that all the keys are correct and to know whether there is any fault. 

So, if any one challenges the answer key and the correction is valid, NTA applies than correction. 

And please be ensured that everyone will get the benefits of corrections. 

All the correction are for all of you. 

Hope this will help. 

Fell free to ask any doubts.