Question: Which drug did the artist nominated for Billboard Music Award for No.1 World Artist award overdose on during her death?
Answer(s):
answer: Cocaine overdose

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:award.award_nominee.award_nominations ?k .
?k ns:award.award_nomination.award ns:m.0111tkwy . 
?c ns:people.deceased_person.cause_of_death ?x .
?x ns:people.cause_of_death.parent_cause_of_death ns:m.01tf_6 .
}