What is the origin of the grape whose wine region is the Troodos Mountains ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/wineRegion> <http://dbpedia.org/resource/Troodos_Mountains> . ?x <http://dbpedia.org/ontology/origin> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Grape>}
Troodos_Mountains