Tirana is the largest city of which country?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/largestCity> <http://dbpedia.org/resource/Tirana>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Country>}
Tirana