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 is the causes of death of the actor who played the character NASCAR Driver #2? 
Knowledge Triplets: Dale Earnhardt, film.actor.film, m.0t_b240
Carlos Pardo, people.deceased_person.cause_of_death, Racing Accident
Fictional Character, freebase.type_profile.kind, Portrayal
Racing Accident, people.cause_of_death.people, Giulio Bartali
Film character, freebase.type_profile.strict_included_types, Fictional Character
Dale Earnhardt, people.deceased_person.cause_of_death, Basilar skull fracture
Racing Accident, people.cause_of_death.people, Carlos Pardo
Fictional Character, freebase.type_profile.strict_included_types, Topic
Giulio Bartali, people.deceased_person.cause_of_death, Racing Accident
Film character, type.type.expected_by, Character using Wham-O product
NASCAR Driver #2, common.topic.notable_for, g.12h33l42w
Hemotympanum, medicine.symptom.symptom_of, Basilar skull fracture
Film character, freebase.type_profile.published, Published
Dale Earnhardt, people.deceased_person.cause_of_death, Racing Accident
Character, rdf-schema#range, Film character
Racing Accident, people.cause_of_death.people, Dale Earnhardt
Character, type.property.expected_type, Film character
Roland Ratzenberger, people.deceased_person.cause_of_death, Racing Accident
Film character, type.type.expected_by, Character
Racing Accident, people.cause_of_death.people, Jason Leffler
Character, type.property.reverse_property, Portrayed in films
Film character, freebase.type_hints.included_types, Topic
Stroker Ace, film.film.starring, m.0t_b240
Raccoon eyes, medicine.symptom.symptom_of, Basilar skull fracture
Topic, freebase.type_profile.kind, Portrayal
Topic, freebase.type_profile.published, Published
Film character, freebase.type_hints.included_types, Fictional Character
Racing Accident, people.cause_of_death.people, Roland Ratzenberger
Fictional Character, freebase.type_hints.included_types, Topic
Basilar skull fracture, base.disaster2.type_of_injury.included_in_injury, Bone fracture
Racing Accident, people.cause_of_death.people, Ayrton Senna
Basilar skull fracture, medicine.disease.symptoms, Hemotympanum
Film character, freebase.type_profile.kind, Annotation
Film character, type.type.properties, Portrayed in films
Jason Leffler, people.deceased_person.cause_of_death, Racing Accident
Dale Earnhardt, people.deceased_person.cause_of_death, Basilar skull fracture
Film character, freebase.type_profile.kind, Portrayal
NASCAR Driver #2, film.film_character.portrayed_in_films, m.0t_b240
NASCAR Driver #2, film.performance.character, m.0t_b240
Film character, common.topic.article, m.02_96_z
m.0t_b240, film.performance.film, Stroker Ace
Film character, type.type.expected_by, Other conquests
Bone fracture, base.disaster2.type_of_injury.includes_injury, Basilar skull fracture
Basilar skull fracture, base.consumermedical.medical_term.consumer_name, Basilar skull fracture
Film character, type.type.domain, Film
Fictional Character, freebase.type_profile.published, Published
Ayrton Senna, people.deceased_person.cause_of_death, Racing Accident
Basilar skull fracture, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0086-34bd
Dale Earnhardt, people.deceased_person.cause_of_death, Racing Accident
m.0t_b240, film.performance.character, NASCAR Driver #2
m.0t_b240, film.performance.actor, Dale Earnhardt
m.0t_b240, film.actor.film, Dale Earnhardt
Basilar skull fracture, people.cause_of_death.people, Dale Earnhardt
Character, owl#inverseOf, Portrayed in films
Film character, type.type.expected_by, Killed by
Film character, freebase.type_profile.strict_included_types, Topic
Film character, type.type.properties, Portrayed in films (dubbed)
Film, type.domain.types, Film character
NASCAR Driver #2, common.topic.notable_types, Film character
Basilar skull fracture, medicine.disease.symptoms, Raccoon eyes

Answer: Racing Accident
Basilar skull fracture