Question: What countries were involved in a conflict with South Vietnam?
Answer(s):
answer: Pathet Lao
answer: Kingdom of Laos
answer: Khmer Rouge
answer: North Korea
answer: Philippines
answer: Soviet Union
answer: Khmer Republic
answer: Taiwan
answer: South Korea
answer: Thailand
answer: United States of America
answer: Australia
answer: New Zealand
answer: China
answer: South Vietnam
answer: North Vietnam
answer: Viet Cong

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:military.military_conflict.commanders ?k .
?k ns:military.military_command.military_combatant ns:m.0g8bw . 
?c ns:military.military_conflict.combatants ?y .
?y ns:military.military_combatant_group.combatants ?x .
}