Due to the " my feed will not validate on w3.org. How do I allow the quotes in the feed, I am currently using

Code:
$description = htmlentities(stripslashes($result['description']), ENT_QUOTES);
$description = str_replace("&", "&", $description);
$description = str_replace("'", "'", $description);
What else can I do to allow the " to show up ?