Slashes displayed in incorrect responses for short answer questions

In item analysis, incorrect responses at short answer questions are displayed with slashes before quotes (see attachment).

To get rid of this I did:

— mod/quiz/report/analysis/report.php ORIGINAL
+++ mod/quiz/report/analysis/report.php MODIFIED
@@ -332,6 +332,7 @@
} else

+ $resp = s($resp, TRUE); // line added to get rid of slashes
$response->credit = '<span class="'.$qclass.'">('.format_float($q['credits'][$aid],2).') </span>';
$response->text = '<span class="'.$qclass.'">'.format_text("$resp", FORMAT_MOODLE, $format_options, $quiz->course).' </span>';
$count = $q['rcounts'][$aid].'/'.$q['count'];