Registration Mandatory Question
 

How can I make people that are registering answer a mandatory question?

In other words, I want to insert a question that i want people to answer and they have to answer it before they can register?

Is there a mod that does this, or is it something in the vbulletin control panel that will allow me to do this? If so where can I find it?

If there is a mod, please tell me what it's called.

Thanks

Create a Profile Field through the Admin CP and set the Field Required setting.