Storyline block in Rise to be completed first before Continue button appears

Hi there

I am using a Storyline interaction in Rise. The interaction is simple - answer a question. I want the user to answer first and only then be able to move on. I use the Continue button with a restriction "Complete blocks directly above" but the Continue button appears immediately because the Storyline block is considered completed as soon as it appears. 

How to restrict the Continue button from showing until the user has actually answered the question in the Storyline block?

Thanks

Bobby