Question: In which country is the Mekong river located where a military combatant was involved in the Vietnam War?
Answer(s):
answer: Cambodia
answer: Thailand
answer: China
answer: China

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0j0g5)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0j0g5 ns:location.location.partially_containedby ?x .
?x ns:military.military_combatant.casualties ?c .
?c ns:military.casualties.military_conflict ns:m.07_nf . 
}