Question: Which country includes the President of the European Council and is a member of the Organization?
Answer(s):

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:organization.organization.leadership ?k .
?k ns:organization.leadership.role ns:m.02vk5s1 . 
?c ns:organization.membership_organization.members ?y .
?y ns:organization.organization_membership.from ?x .
}