Question: What language is spoken by the ethnic group which includes the Sihasapa Indians?
Answer(s):
answer: English Language
answer: Lakota 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:people.ethnicity.includes_groups ns:m.020682 . 
?c ns:people.ethnicity.languages_spoken ?x .
}