What are the political parties whose leaders have lived in the Prime Minister's House?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/residence> <http://dbpedia.org/resource/Prime_Minister's_House_(Colombo)> . ?uri <http://dbpedia.org/ontology/leader> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/PoliticalParty>}
Prime_Minister's_House_(Colombo)