How to keep text from being visible through walls?

In our current project we have a row of walls with questions on each one. The questions behind each wall are visible through the wall that the player is on. How can we make it to where the question that we are on is only visible?

Let’s be honest, had you tried googling it, it would have taken you 10 seconds to find an answer instead of waiting for over a month…

Anyway, http://wiki.unity3d.com/index.php?title=3DText

Either that or use a different text version, so create your text via a GUI or texture instead.