Echo top most parent (ancestor) category of a post

Echo top most parent (ancestor) category of a post

References

Reference NO 1

http://stackoverflow.com/questions/15190163/echo-top-most-parent-ancestor-category-of-a-post

Reference NO 2

http://codex.wordpress.org/Function_Reference/get_post_ancestors

Reference NO 3

http://wordpress.stackexchange.com/questions/67512/subnav-menu-adapt-to-show-the-same-on-parent-child-grandchildren-pages

Reference NO 4

http://cssglobe.com/wordpress-find-pages-top-level-parent-id/

Reference NO 5

http://wpsnipp.com/index.php/functions-php/display-back-to-parent-page-link-with-get_post_ancestors/

Reference NO 6

http://wiki.pixelpress.com.au/2010/03/22/various-code-for-parent-grandparent-pages-in-wordpress/

Reference NO 7

http://wpquestions.com/question/showChrono/id/8107

Reference NO 8

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