Limit Users viewing others posts... is this possible?

[buyinflatables]

Hi there,

I offer a lot of contests on my forum where members can win stuff. Normally I would post a question and the members would reply. But once a member replies with the correct answer... everyone follows with the same answer.

Is there a way for members to post an answer, but not see other members posts but I as an admin or a moderator would see all the posts normally?

This will decrase my exposure on contests where I state All those with the correct answer will win. LOL

Is this possible with Vbulletin or is there amod available?

Thank you