Question: Which people are known for appearing on the television show Dragon's Den?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/knownFor> <http://dbpedia.org/resource/Dragons'_Den_(UK_TV_series)>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}