post-secondary institution in Washington, D.C.
... that Georgetown University is the oldest post-secondary institution in Washington, D.C.?
... that <a href="./Georgetown_University" id="mwCSA" rel="mw:WikiLink" title="Georgetown University">Georgetown University</a> is the oldest <b id="mwCSE"><a href="./List_of_colleges_and_universities_in_Washington,_D.C." id="mwCSI" rel="mw:WikiLink" title="List of colleges and universities in Washington, D.C.">post-secondary institution in Washington, D.C.</a></b>?