Question: What country was involved in the Vietnam War and is governed by the Chinese Ministry of Public Security?
Answer(s):
answer: China

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.07_nf)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.07_nf ns:military.military_conflict.combatants ?y .
?y ns:military.military_combatant_group.combatants ?x .
?x ns:government.governmental_jurisdiction.governing_officials ?c .
?c ns:government.government_position_held.governmental_body ns:m.01ncvk . 
}