I need help with post category.

Hello,
I hop some one understand my Idea ??
in my frontpage i used 2 category to show “News” and “other” post content, so i set 2 templates (news.php and other.php) who i’d like to include one of theme when the single.php load.
so how can i let the single.php to know that the link i click it’s from the “news” or “others” category, like in this exemple who work only with the “Category”

<?php if (is_category('news')) { ?>
include News template
  <?php } else { ?>
include other template
  <?php } ?>

Big thanks for your HELP