The answer really depends on how you are collecting the answers. If you are just collecting them and storing them in session variables, then you'll have to have a processing loop on the result page that displays only the questions that received a "yes" response. If you are using a database, then you could have the result page generated using a SQL statement similar to the following:
"SELECT * from SurveyResults where Response = 'Yes'". If you are storing the results to a text file, then I would only store the questions that received "Yes" responses (assuming each student gets his/her own file).
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