Are you a human?

[K2_02]

Due to the lose of so many users by not receiving their confirmation email (spam filtering on the users end) - I'm considering disabling it. However, I would still like a way to keep bots from spamming my site.

On other sites I've used a simple question during registration that requires a specific answer. Like "Are you human?" or "What is 2+2."

Is there a way to do this? I've searched but couldn't find anything. THANKS!