Question: What was the cause of death of the person who said, "A dirty joke is a sort of mental rebellion"?
Answer(s):
answer: Tuberculosis

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:people.person.quotations ns:m.048jmrd . 
?c ns:people.deceased_person.cause_of_death ?x .
}