Am I able to create a conditional action or user variable on a question slide?

Hey everyone

We have modules where there is content slides mixed with question slides. We want the learner to answer the questions and not skip them so originally we removed the next button and just used the continue function of the question. We have lots of feedback from people that they are getting stuck as they want to go back and review the content but once they hit the question slide again (which they may have already answered) they cant get past it as they have already answered it and there is no 'next' button so they have to close and reopen the module.

Is there a way to make it so they have to answer the question but once they have answered it the 'next' button appears so they can then keep going back and forwards within the module. I was wondering if it was possible using a conditional action or user variable?

Thanks

Sarah