Question: What type of political system is used in the country with the currency of Iranian rial?
Answer(s):
answer: Parliamentary system
answer: Presidential system
answer: Islamic republic
answer: Unitary state
answer: Theocracy

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.034n11 . 
?c ns:location.country.form_of_government ?x .
}