Caller verification tools

Hi,

We have a requirement,

when customer calls to callcenter,  they need to verify the caller by asking some questions like DOB....etc If they answer correctly to atleast 3 questions then only they are genuine customer.

(1 approach which i know is,  creating a custom entity with questions and prompt this entity from contact record.)

Can you suggest any existing tools/Add-on s for this purpose?

Which is the best approach to implement this?

Thanks