Question: What form of currency is used in the nation where the capital is Guatemala City?
Answer(s):
answer: Guatemalan quetzal

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.capital ns:m.0346h . 
?c ns:location.country.currency_used ?x .
}