How to connect a question to a drop down answer

I'm not sure what you mean, but I think you want to show a field only when a certain answer is selected or provided into another field. If so, then guide will help you: 

http://www.jotform.com/help/316-How-to-show-or-hide-a-field-in-the-form-based-on-the-other-field-input-or-selection

If not, please explain further so we can assist you properly.

Thanks