Display Only One Category

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On my WordPress theme, it displays all of the categories a post is in on the homepage for the post block, I only want to display one category even if a post is under multiple categories.

i.e. Category One, Category Two, Category Three

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I want it to be Category One…

This is the code that is in place at the moment: 

<h2><?php the_category(', ') ?></h2>
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  1. Here’s snippet to display first category from post.

    $category = get_the_category();

if ( $category[0] ) {
    echo '<h2><a href="' . get_category_link( $category[0]->term_id ) . '">' . $category[0]->cat_name . '</a></h2>';
}

    Original idea of the code is from WordPress Codex