Question: What Language do they speak in the Country featuring the Argentine peso as the accepted Currency?
Answer(s):
answer: Italian Language
answer: Guaraní language
answer: Quechuan languages
answer: Spanish Language
answer: Yiddish 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:location.country.currency_formerly_used ns:m.0b85dl . 
?c ns:location.country.languages_spoken ?x .
}