Matching Drag and Drop Variables

What variables should I use to create my own Correct and Incorrect feedback to a matching drag and drop. In other words, how can I tell whether a user has made a correct or incorrect match. Is there a system variable we can access?

The problem is that the Storyline feedback box can't be moved, so it covers up the interaction when a learner might want to look at it and it is difficult to read a longer answer in that box. Thanks.

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