Quiz Feedback - vary based on which wrong answer they pick?

I've got a multiple response quiz question, and my pilot testers keep picking only one of the two correct answers.  I'd like to give them feedback based on the one they pick.

For example, if the question says "Pick all the colors that are blue" and they pick "azure" but not "cerulean," I don't want to just say they were wrong, because they weren't, but I want to tell them there are more correct answers.

I'm thinking of some trigger on the "Try Again" layer that can show different messages, but I'm not sure how to capture which responses they picked. 

Is there any way to capture a variable or pass that value somehow?

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