Usergroup Depending On Q&A Answer When Registering?

[PPC Coach]

I'm using the Q&A when they register to prevent spammers and it works awesome.

I would like to take it to the next level if possible.

If the new registrant answers "secretcode1", I want them put into the normal usergroup.

However, if the new registrant answers "secretcode2", I want to put them into the "Premium" usergroup.

Is there a way to check what answer they give and assign them to the correct usergroup like this?
Usergroup Depending On Q&A Answer When Registering?

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