Question: What's the national language, of the location where the film, "The Alchemist of Happiness" occurs?
Answer(s):
answer: Persian Language

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_location.featured_in_films ns:m.0c2_wc . 
?c ns:location.country.official_language ?x .
}