resetting answers

On a single question with multiple correct answers, how do i retain only the correct selections?

For example: student answers question wrong and the content is replayed and defaults back to question. I need only the correct selection(s) shown and the wrong selection(s) wiped away. i just need to retain the correct selections so student doesn't have to start over and re-answer selections he got right. Is there a Lectora way of doing this?

thanks, chase