Question: What were some of the items invented by the primary subject in the film "The secret of Nikola Tesla"?
Answer(s):
answer: Neon lamp
answer: Induction motor
answer: Wireless telegraphy
answer: Three-phase electric power
answer: Tesla coil
answer: Alternating current
answer: Remote control

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:film.film_subject.films ns:m.0c01pl4 . 
?c ns:law.inventor.inventions ?x .
}