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 was the surgery on the person who played Jo Livingstone for? 
Knowledge Triplets: Film character, freebase.type_hints.included_types, Topic
Film character, type.type.properties, Portrayed in films
Film character, type.type.expected_by, Character
Anal cancer, base.consumermedical.medical_term.consumer_name, Anal cancer
Anal cancer, people.cause_of_death.people, Farrah Fawcett
Character, type.property.expected_type, Film character
Anal cancer, medicine.disease.parent_disease, Cancer
Anal cancer, medicine.disease.notable_people_with_this_condition, Farrah Fawcett
Film character, type.type.expected_by, Character using Wham-O product
m.0b3wj_j, film.performance.film, See You in the Morning
Character, owl#inverseOf, Portrayed in films
Anal cancer, people.cause_of_death.people, Gwen Welles
Topic, freebase.type_profile.published, Published
Fictional Character, freebase.type_hints.included_types, Topic
Film character, type.type.domain, Film
Character, rdf-schema#range, Film character
Film character, freebase.type_profile.kind, Annotation
Character, type.property.reverse_property, Portrayed in films
Film character, type.type.properties, Portrayed in films (dubbed)
Anal cancer, medicine.disease.medical_specialties, Oncology
m.0b3wj_j, film.performance.character, Jo Livingstone
Cancer, medicine.disease.includes_diseases, Anal cancer
See You in the Morning, film.film.starring, m.0b3wj_j
Fictional Character, freebase.type_profile.published, Published
Film character, freebase.type_profile.published, Published
m.0r0350n, dataworld.gardening_hint.last_referenced_by, Anal cancer
Jo Livingstone, film.film_character.portrayed_in_films, m.0b3wj_j
Film character, freebase.type_profile.kind, Portrayal
Farrah Fawcett, film.actor.film, m.0b3wj_j
Film, type.domain.types, Film character
Film character, common.topic.article, m.02_96_z
Jo Livingstone, film.film_character.portrayed_in_films, m.0b3wj_j
Cancer, people.cause_of_death.includes_causes_of_death, Anal cancer
Fictional Character, freebase.type_profile.kind, Portrayal
Jo Livingstone, common.topic.notable_types, Film character
Gwen Welles, people.deceased_person.cause_of_death, Anal cancer
Film character, freebase.type_profile.strict_included_types, Topic
Film character, type.type.expected_by, Other conquests
Film character, type.type.expected_by, Killed by
m.0b3wj_j, film.performance.actor, Farrah Fawcett
Anal cancer, people.cause_of_death.parent_cause_of_death, Cancer
Oncology, medicine.medical_specialty.diseases_treated, Anal cancer
Topic, freebase.type_profile.kind, Portrayal
Fictional Character, freebase.type_profile.strict_included_types, Topic
Film character, freebase.type_hints.included_types, Fictional Character
Farrah Fawcett, medicine.disease.notable_people_with_this_condition, Anal cancer
Film character, freebase.type_profile.strict_included_types, Fictional Character
Farrah Fawcett, medicine.notable_person_with_medical_condition.condition, Anal cancer
Jo Livingstone, common.topic.notable_for, g.125680nlh
m.0b3wj_j, film.actor.film, Farrah Fawcett
Farrah Fawcett, people.deceased_person.cause_of_death, Anal cancer

Answer: Anal cancer