Question: What film involved National Film Board of Canada and featured Madonna?
Answer(s):
answer: Arthur and the Invisibles

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01vs_v8)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01vs_v8 ns:film.actor.film ?y .
?y ns:film.performance.film ?x .
?x ns:film.film.genre ?c .
?c ns:organization.organization_sector.organizations_in_this_sector ns:m.014l4w . 
}