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: From what ailment did the actress who portrayed Sandra Carpenter die? 
Knowledge Triplets: Film character, freebase.type_profile.published, Published
m.03lw1x6, film.performance.character, Sandra Carpenter
Marsden Jones, people.deceased_person.cause_of_death, Aortic dissection
Aortic dissection, base.schemastaging.context_name.pronunciation, g.125_m81r8
Aortic dissection, people.cause_of_death.people, Eiichi Ohtaki
heart attack, medicine.disease.causes, Aortic dissection
Film character, type.type.expected_by, Character
Aortic dissection, people.cause_of_death.people, Judi Ann Mason
Judi Ann Mason, people.deceased_person.cause_of_death, Aortic dissection
Fictional Character, freebase.type_hints.included_types, Topic
Paul O. Williams, people.deceased_person.cause_of_death, Aortic dissection
Fictional Character, freebase.type_profile.kind, Portrayal
Cardiovascular disease, medicine.disease.includes_diseases, Aortic dissection
Aortic dissection, people.cause_of_death.people, Marsden Jones
Character, type.property.reverse_property, Portrayed in films
Lured, film.film.starring, m.03lw1x6
Sandra Carpenter, common.topic.notable_for, g.1254xvj17
Film character, type.type.expected_by, Character using Wham-O product
Cardiovascular disease, people.cause_of_death.includes_causes_of_death, Aortic dissection
Fictional Character, freebase.type_profile.strict_included_types, Topic
m.03lw1x6, film.performance.actor, Lucille Ball
Eiichi Ohtaki, people.deceased_person.cause_of_death, Aortic dissection
Aortic dissection, medicine.disease_cause.diseases, heart attack
Sandra Carpenter, film.film_character.portrayed_in_films, m.03lw1x6
m.03lw1x6, film.performance.film, Lured
Film character, type.type.expected_by, Killed by
m.03lw1x6, film.performance.actor, Lucille Ball
Film character, freebase.type_profile.kind, Portrayal
Aortic dissection, people.cause_of_death.people, Jonathan Larson
Lucille Ball, film.actor.film, m.03lw1x6
Aortic dissection, people.cause_of_death.people, Paul O. Williams
Aortic dissection, people.cause_of_death.people, Tomoyuki Dan
Sandra Carpenter, common.topic.notable_types, Film character
Film character, freebase.type_profile.strict_included_types, Topic
Aortic dissection, people.cause_of_death.parent_cause_of_death, Cardiovascular disease
Aortic dissection, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-e244
Fictional Character, freebase.type_profile.published, Published
Aortic dissection, people.cause_of_death.people, Lucille Ball
Sandra Carpenter, film.film_character.portrayed_in_films, m.03lw1x6
John Ritter, people.deceased_person.cause_of_death, Aortic dissection
Character, rdf-schema#range, Film character
Character, owl#inverseOf, Portrayed in films
Film character, freebase.type_hints.included_types, Fictional Character
Film character, freebase.type_profile.kind, Annotation
Film character, freebase.type_hints.included_types, Topic
Topic, freebase.type_profile.published, Published
Film, type.domain.types, Film character
Character, type.property.expected_type, Film character
Jonathan Larson, people.deceased_person.cause_of_death, Aortic dissection
Film character, type.type.properties, Portrayed in films
Film character, freebase.type_profile.strict_included_types, Fictional Character
Film character, common.topic.article, m.02_96_z
Tomoyuki Dan, people.deceased_person.cause_of_death, Aortic dissection
Lucille Ball, people.deceased_person.cause_of_death, Aortic dissection
Film character, type.type.properties, Portrayed in films (dubbed)
Aortic dissection, base.consumermedical.medical_term.consumer_name, Aortic dissection
Lucille Ball, people.deceased_person.cause_of_death, Aortic dissection
Film character, type.type.expected_by, Other conquests
Topic, freebase.type_profile.kind, Portrayal
Film character, type.type.domain, Film
Aortic dissection, medicine.disease.parent_disease, Cardiovascular disease
Aortic dissection, people.cause_of_death.people, John Ritter

Answer: Aortic dissection