Question: President of Ghana is the leader title of which country?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri prop:leaderTitle <http://dbpedia.org/resource/President_of_Ghana>  . ?uri rdf:type onto:Country}