what interaction is best for this?

As an educator, I strongly disagree with the setup.  Never violate your student's expectations or understanding of what you expect them to do.  

Creating a text where all answers are false betrays their reasonable expectations and violates their assumed expectations of how your assessments work. 

If you are ever going to mess with this at all you MUST clearly explain what you are doing and show an example of this. 

You might be able to get away with this in real life, or if this was just a game.  However, eLearning environments suck.  Never forget that for the student this is a bad compromise for a better experience.  You are not there to answer their questions and to give them feedback.  You are not there to reassure them by your presence that you, as a person know what you're doing and wish them no ill.  With software all students can assume is that something is broken.