Question: Is Maria Sharapova the silver medalist of Tennis at the 2012 Summer Olympics  Women's singles?
SPARQL:
ASK WHERE { <http://dbpedia.org/resource/Tennis_at_the_2012_Summer_Olympics_â€“_Women's_singles> <http://dbpedia.org/ontology/silverMedalist> <http://dbpedia.org/resource/Maria_Sharapova> }