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: Where did the subject of the image 464px-Kate_Middleton_at_the_Garter_Procession_2008.jpg attend prep school? 
Knowledge Triplets: St Andrew's School, Pangbourne, education.educational_institution.students_graduates, m.0nf_x05
Catherine, Duchess of Cambridge, freebase.valuenotation.is_reviewed, Height
Preparatory school, education.school_category.schools_of_this_kind, St Andrew's School, Pangbourne
British Royal Family, people.family.members, Catherine, Duchess of Cambridge
William & Kate, film.film.subjects, Catherine, Duchess of Cambridge
Preparatory school, common.topic.article, m.07g47n
St Andrew's School, Pangbourne, education.educational_institution.colors, Green
m.0dm4l6j, common.webpage.topic, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, people.person.places_lived, m.03pv20m
m.02wn__c, education.education.student, Catherine, Duchess of Cambridge
Prince George of Cambridge, people.person.parents, Catherine, Duchess of Cambridge
Church of England, religion.religious_organization.associated_with, Anglicanism
School category, type.type.expected_by, Accademia Anja
School category, type.type.properties, Schools of this kind
House of Windsor, people.family.members, Princess Charlotte of Cambridge
House of Windsor, people.family.members, Catherine, Duchess of Cambridge
m.0gyy8fc, film.personal_film_appearance.person, Catherine, Duchess of Cambridge
School category, freebase.type_profile.strict_included_types, Topic
Noble person, freebase.type_hints.included_types, Topic
School type, owl#inverseOf, Schools of this kind
School category, type.type.expected_by, school_type
Catherine, Duchess of Cambridge, symbols.namesake.named_after, Cambridge
Catherine, Duchess of Cambridge, people.person.education, m.04q1brm
m.010ggth_, royalty.noble_title_tenure.noble_person, Catherine, Duchess of Cambridge
Prince George of Cambridge, people.family_member.family, House of Windsor
School category, freebase.type_profile.published, Published
Catherine, Duchess of Cambridge, people.person.religion, Anglicanism
Princess Charlotte of Cambridge, people.family_member.family, House of Windsor
Michael Francis Middleton, people.person.children, Catherine, Duchess of Cambridge
School category, freebase.documented_object.documentation, m.021y5qd
Michael Francis Middleton, people.person.nationality, England
464px-Kate_Middleton_at_the_Garter_Procession_2008.jpg, common.image.appears_in_topic_gallery, Catherine, Duchess of Cambridge
m.0gbmxv5, people.sibling_relationship.sibling, Catherine, Duchess of Cambridge
St Andrew's School, Pangbourne, organization.organization.date_founded, 1934
m.0hq4lvt, award.ranking.item, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, royalty.noble_person.titles, m.010ggth_
Catherine, Duchess of Cambridge, people.person.religion, Church of England
Catherine, Duchess of Cambridge, film.film_subject.films, William & Catherine: A Royal Romance
School category, type.type.domain, Education
House of Windsor, people.family.members, Prince George of Cambridge
Topic, freebase.type_profile.published, Published
Preparatory school, common.topic.notable_types, School category
Catherine, Duchess of Cambridge, people.person.places_lived, m.03plx6x
Catherine, Duchess of Cambridge, people.person.education, m.0nf_x05
m.0nf_x05, education.education.institution, St Andrew's School, Pangbourne
Catherine, Duchess of Cambridge, people.person.gender, Female
St Andrew's School, Pangbourne, education.educational_institution.school_type, Independent school
Catherine, Duchess of Cambridge, common.topic.image, 464px-Kate_Middleton_at_the_Garter_Procession_2008.jpg
m.0nf_x05, education.education.student, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, royalty.noble_person.titles, m.010ggtcy
Cambridge, symbols.name_source.namesakes, Catherine, Duchess of Cambridge
Royal Berkshire Hospital, location.location.people_born_here, Catherine, Duchess of Cambridge
m.03plx6x, people.place_lived.person, Catherine, Duchess of Cambridge
Kate Middleton 2008, common.image.appears_in_topic_gallery, Catherine, Duchess of Cambridge
Noble person, freebase.type_profile.strict_included_types, Topic
m.010ggtgp, royalty.noble_title_tenure.noble_person, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, people.person.nationality, England
Catherine, Duchess of Cambridge, people.family_member.family, British Royal Family
464px-Kate_Middleton_at_the_Garter_Procession_2008.jpg, common.image.size, m.0252qkv
m.04q1brm, education.education.student, Catherine, Duchess of Cambridge
m.010ggtcy, royalty.noble_title_tenure.noble_person, Catherine, Duchess of Cambridge
St Andrew's School, Pangbourne, organization.organization.headquarters, m.0wh9lwl
Catherine, Duchess of Cambridge, common.topic.webpage, m.0dm4l6j
m.03pv20m, people.place_lived.person, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, people.person.education, m.0n0kxws
Catherine, Duchess of Cambridge, people.person.education, m.0nf_x05
Preparatory school, common.topic.notable_for, g.1yl5nzhpv
Catherine, Duchess of Cambridge, people.person.parents, Carole Elizabeth Middleton
School type, rdf-schema#range, School category
Cambridge, location.location.containedby, England
Anglicanism, religion.religion.organizations, Church of England
m.0ggbv_5, people.marriage.spouse, Catherine, Duchess of Cambridge
School category, common.topic.article, m.021y5qd
Catherine, Duchess of Cambridge, common.topic.notable_for, g.125bjkszy
Carole Elizabeth Middleton, people.person.children, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, people.person.children, Princess Charlotte of Cambridge
Catherine, Duchess of Cambridge, people.person.place_of_birth, Royal Berkshire Hospital
Carole Elizabeth Middleton, people.person.gender, Female
School type, type.property.reverse_property, Schools of this kind
St Andrew's School, Pangbourne, location.location.geolocation, m.0z8stnw
Catherine, Duchess of Cambridge, common.topic.notable_types, Noble person
m.0fpq0tm, people.sibling_relationship.sibling, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, people.person.education, m.02wn__c
Catherine, Duchess of Cambridge, film.film_subject.films, William & Kate
Catherine, Duchess of Cambridge, people.person.children, Prince George of Cambridge
School category, freebase.type_hints.included_types, Topic
School category, type.type.expected_by, School type
William & Catherine: A Royal Romance, film.film.subjects, Catherine, Duchess of Cambridge
Education, type.domain.types, School category
Preparatory school, education.educational_institution.school_type, St Andrew's School, Pangbourne
Catherine, Duchess of Cambridge, people.person.sibling_s, m.0fpq0tm
Catherine, Duchess of Cambridge, film.person_or_entity_appearing_in_film.films, m.0gyy8fc
Catherine, Duchess of Cambridge, common.topic.image, Kate Middleton 2008
Catherine, Duchess of Cambridge, common.topic.article, m.05mnc8
464px-Kate_Middleton_at_the_Garter_Procession_2008.jpg, common.topic.image, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, royalty.noble_person.titles, m.010ggtgp
Prince George of Cambridge, common.topic.notable_types, Noble person
Catherine, Duchess of Cambridge, film.person_or_entity_appearing_in_film.films, m.0gyycnp
Catherine, Duchess of Cambridge, people.person.spouse_s, m.0ggbv_5
Catherine, Duchess of Cambridge, people.family_member.family, House of Windsor
St Andrew's School, Pangbourne, education.educational_institution.colors, White
Princess Charlotte of Cambridge, people.person.parents, Catherine, Duchess of Cambridge
School type, type.property.expected_type, School category
m.0gyycnp, film.personal_film_appearance.person, Catherine, Duchess of Cambridge
m.0n0kxws, education.education.student, Catherine, Duchess of Cambridge
Catherine, Duchess of Cambridge, award.ranked_item.appears_in_ranked_lists, m.0hq4lvt
School category, type.type.expected_by, Schools
St Andrew's School, Pangbourne, education.educational_institution.school_type, Preparatory school
School category, freebase.type_profile.kind, Classification
Catherine, Duchess of Cambridge, people.person.parents, Michael Francis Middleton
Catherine, Duchess of Cambridge, people.person.sibling_s, m.0gbmxv5
Independent school, education.school_category.schools_of_this_kind, St Andrew's School, Pangbourne
m.0nf_x05, education.educational_institution.students_graduates, St Andrew's School, Pangbourne

Answer: St Andrew's School, Pangbourne