Question: Which city is known for the people working in the western penn hospital?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/workInstitutions> <http://dbpedia.org/resource/Western_Pennsylvania_Hospital> . ?x <http://dbpedia.org/ontology/knownFor> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}