From which party is the politician who was selected  in Barasat constituency?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/constituency> <http://dbpedia.org/resource/Barasat_(Lok_Sabha_constituency)> . ?x <http://dbpedia.org/ontology/party> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/OfficeHolder>}
Barasat_(Lok_Sabha_constituency)