user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: What killed the producer of Whitney: The Greatest Hits? 
Knowledge Triplets: Musical Release, type.type.properties, Producers
Musical Release, type.type.expected_by, releases_produced
Musical Release, type.type.properties, Format
Topic, freebase.type_profile.published, Published
Region, type.property.schema, Musical Release
Musical Release, type.type.expected_by, Release
Whitney: The Greatest Hits, common.topic.notable_for, g.125gv1mp9
Whitney: The Greatest Hits, common.topic.notable_types, Musical Release
Musical Release, type.type.properties, Engineers
Musical Release, type.type.properties, Credited as
Region, rdf-schema#domain, Musical Release
Musical Release, type.type.expected_by, Musical Release
Musical Release, type.type.expected_by, primary_release
Musical Release, type.type.expected_by, Primary release
Musical Release, freebase.type_profile.strict_included_types, Non-Agent
Musical Release, freebase.type_hints.included_types, Topic
Musical Release, freebase.type_profile.kind, Definition
Musical Release, freebase.type_profile.published, Published
Musical Release, common.topic.article, m.01z0msw
Musical Release, type.type.domain, Music
Musical Release, type.type.properties, Running Time
Musical Release, type.type.properties, Region
Musical Release, freebase.type_profile.strict_included_types, Topic
Musical Release, type.type.expected_by, Releases produced
Musical Release, freebase.documented_object.documentation, m.01z0msw
Musical Release, type.type.properties, Release of
Musical Release, type.type.properties, Catalog Number
Musical Release, type.type.properties, Label
Musical Release, type.type.expected_by, Releases engineered
Musical Release, type.type.expected_by, Releases
Musical Release, type.type.properties, Track list
Musical Release, type.type.properties, Tracks
Musical Release, type.type.properties, Release Date
Musical Release, freebase.type_profile.equivalent_topic, Release

Answer: Drowning
Coronary artery disease
Cocaine overdose