Question: What kind of cancer caused the death of the actor from "Third World?"?
Answer(s):
answer: Acral lentiginous melanoma
answer: Metastatic Melanoma

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:film.actor.film ?k .
?k ns:film.performance.film ns:m.0w0jc5p . 
?c ns:people.deceased_person.cause_of_death ?x .
?x ns:people.cause_of_death.parent_cause_of_death ns:m.0qcr0 .
}