Question: The country that uses the Nigerian naira as its main form of currency is located in which time zone?
Answer(s):
answer: West Africa Time Zone

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_used ns:m.018cg3 . 
?c ns:location.location.time_zones ?x .
}