Question: What is the name of the sports team whose stadium is called FedExField?
Answer(s):
answer: Boston Redskins

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:sports.sports_team.arena_stadium ns:m.023809 . 
?c ns:sports.sports_team.previously_known_as ?x .
}