Hide Thumbnail Sizes from Media Uploader in WordPress

This code hides certain thumbnail sizes from the media uploader, paste this code in your theme’s functions.php file

<?php
	function remove_image_size($possible_sizes) {
		unset( $possible_sizes['small'] );
		unset( $possible_sizes['medium'] );
		unset( $possible_sizes['large'] );
		return $possible_sizes;
	}
	add_filter('image_size_names_choose', 'remove_image_size');
?>