How to Remove Menu Items in Admin Depending on User Role.

Examples of pages in the Wordpress Admin:
remove_menu_page('edit.php'); // Posts
remove_menu_page('upload.php'); // Media
remove_menu_page('link-manager.php'); // Links
remove_menu_page('edit-comments.php'); // Comments
remove_menu_page('edit.php?post_type=page'); // Pages
remove_menu_page('plugins.php'); // Plugins
remove_menu_page('themes.php'); // Appearance
remove_menu_page('users.php'); // Users
remove_menu_page('tools.php'); // Tools
remove_menu_page('options-general.php'); // Settings