Question: Who was Betty White's spouse to whom she remain the living widow?
Answer(s):
answer: Allen Ludden

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.025mb_)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.025mb_ ns:people.person.spouse_s ?y .
?y ns:people.marriage.spouse ?x .
?y ns:people.marriage.type_of_union ns:m.04ztj .
?x ns:people.deceased_person.date_of_death ?num .
}
ORDER BY ?num LIMIT 1