You can now add student answers as an acceptable answer for free response questions:

For example, let's say that the exemplar answer to a free response question was "they are similar", but the student put "exactly the same" as the free response answer and then marked that they got the question correct. In this case, this free response would likely be flagged for review because the student answer is a bit different than the exemplar. 

If you mark that 'Answer is Acceptable', then "exactly the same" would be added as an acceptable answer that would no longer be flagged in the future for review. These "acceptable answers" are not visible to students, and they will continue only seeing your exemplar answer.