Question: What currency is used in the country that have Isla de la Juventud?
Answer(s):
answer: Cuban peso
answer: Cuban convertible peso

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.administrative_divisions ns:m.01rj40 . 
?c ns:location.country.currency_used ?x .
}