Question: Who is the office holder for constituencies  Castro District and Haight-Ashbury?
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:constituency <http://dbpedia.org/resource/Castro_District,_San_Francisco> . ?uri prop:constituency <http://dbpedia.org/resource/Haight-Ashbury> . ?uri rdf:type onto:OfficeHolder}