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: Which vice presidential candidate spoke at the 70th anniversary of D-Day? 
Knowledge Triplets: Joe Biden, base.popstra.celebrity.eats_at, m.0fpwg82
Joe Biden, book.author.works_written, Political Future of Afghanistan
Joe Biden, government.politician.government_positions_held, m.02_x98m
Joe Biden, government.politician.party, m.02_x98d
Joe Biden, user.avh.default_domain.ellerdale_topic.ellerdale_id, 009a-5f30
m.075_7tf, base.yupgrade.user.topics, Joe Biden
Joe Biden, people.person.places_lived, m.03pq2qc
Joe Biden, sports.pro_athlete.teams, m.0hpnx72
Joe Biden, people.person.children, Ashley Biden
Joe Biden, book.author.works_written, Putin Administration's Policies Toward Non-Russian Regions of the Russian Federation
Event, freebase.type_hints.included_types, Topic
Joe Biden, people.person.date_of_birth, 1942-11-20
m.0vpdd2g, film.personal_film_appearance.person, Joe Biden
m.03l4lnx, education.education.student, Joe Biden
Joe Biden, people.person.places_lived, m.04hzwhy
Joe Biden, people.person.sibling_s, m.04hzwh1
Joe Biden, people.person.parents, Catherine Eugenia Finnegan
m.04hzwkj, education.education.student, Joe Biden
m.09vj0j7, base.yupgrade.user.topics, Joe Biden
Joe Biden, film.person_or_entity_appearing_in_film.films, m.0wzhzlx
m.011sx3x0, film.personal_film_appearance.person, Joe Biden
Joe Biden, government.us_vice_president.vice_president_number, 47
m.0n1pgvw, film.personal_film_appearance.person, Joe Biden
Joe Biden, american_football.football_player.position_s, Halfback
Public speaking event, freebase.type_profile.strict_included_types, Event
Joe Biden, book.author.works_written, Strategies for Homeland Defense
Public speaking event, freebase.type_profile.strict_included_types, Non-Agent
Biden and Walsh, organization.organization.founders, Joe Biden
m.05v4mjh, event.speech_or_presentation.speaker_s, Joe Biden
Barack Obama, event.public_speaker.speeches_or_presentations, m.010r243f
m.04hzwgr, people.sibling_relationship.sibling, Joe Biden
Joe Biden, royalty.chivalric_order_member.belongs_to_order, m.0g9krt9
m.02_x991, government.legislative_committee_membership.member, Joe Biden
Joe Biden, people.person.ethnicity, White people
Strategies for Homeland Defense, book.written_work.author, Joe Biden
Joe Biden, base.propositions.proposition_issue.against, California Proposition 8
Joe Biden, people.person.children, Naomi Biden
m.011s5qnh, organization.leadership.person, Joe Biden
Joe Biden, people.person.employment_history, m.052n2bm
Sword Beach, common.topic.image, Sword Beach
Joe Biden, people.person.spouse_s, m.04hzwly
Barack Obama, government.us_president.vice_president, Joe Biden
m.07v_4y4, base.yupgrade.user.topics, Joe Biden
Joe Biden, people.person.height_meters, 1.83
Joe Biden, base.politicalconventions.vice_presidential_nominee.convention_nominated_at, 2008 Democratic National Convention
Joe Biden, film.person_or_entity_appearing_in_film.films, m.0n1pgvw
Joe Biden, organization.organization_founder.organizations_founded, Biden and Walsh
Beau Biden, people.person.parents, Joe Biden
Joe Biden, nytimes.topic.uri, top$002Freference$002Ftimestopics$002Fpeople$002Fb$002Fjoseph_r_jr_biden
Joe Biden, film.person_or_entity_appearing_in_film.films, m.0vpdd2g
m.010r243f, event.speech_or_presentation.event, 70th anniversary of D-Day and the Battle of Normandy
70th anniversary of D-Day and the Battle of Normandy, event.speech_or_presentation.event, m.010r243f
Putin Administration's Policies Toward Non-Russian Regions of the Russian Federation, book.written_work.author, Joe Biden
m.09sq912, base.yupgrade.user.topics, Joe Biden
m.04s_v0l, government.government_position_held.office_holder, Joe Biden
United States Senate election in Delaware, 2008, government.election.winner, Joe Biden
Joe Biden presidential campaign, 1988, government.election_campaign.candidate, Joe Biden
Speech, event.type_of_public_presentation.presentations_of_this_type, m.010r243f
Sword Beach, location.location.events, 70th anniversary of D-Day and the Battle of Normandy
Joe Biden, visual_art.art_subject.artwork_on_the_subject, White House Situation Room during Operation Neptune's Spear
Joe Biden presidential campaign, 2008, government.election_campaign.candidate, Joe Biden
Joe Biden, people.person.profession, Lawyer
Lawyer, people.profession.people_with_this_profession, Joe Biden
Joe Biden, people.person.employment_history, m.052n2bt
Public speaking event, common.topic.article, m.05r524z
m.02_x98m, government.government_position_held.office_holder, Joe Biden
Ana Marie Cox, base.yupgrade.user.topics, Joe Biden
Event, freebase.type_profile.strict_included_types, Topic
m.04hzwqx, government.government_position_held.office_holder, Joe Biden
Joe Biden, american_football.football_player.position_s, Wide receiver
GeorgeStephanopoulos, base.yupgrade.user.topics, Joe Biden
m.052n2bt, business.employment_tenure.person, Joe Biden
m.03pq2qc, people.place_lived.person, Joe Biden
Political Future of Afghanistan, book.written_work.author, Joe Biden
70th anniversary of D-Day and the Battle of Normandy, common.topic.notable_for, g.11bbqdm6bm
Joe Biden, government.politician.election_campaigns, Joe Biden presidential campaign, 1988
Joe Biden, base.obamabase.cabinet_member.date_selected, 2008-08-23
Joe Biden, people.person.sibling_s, m.04hzwhc
Location, freebase.type_hints.included_types, Topic
Joe Biden, book.author.works_written, International Campaign Against Terrorism
International Campaign Against Terrorism, book.written_work.author, Joe Biden
Joe Biden, fictional_universe.person_in_fiction.representations_in_fiction, Joe Biden
Joe Biden, government.politician.government_positions_held, m.04hzwqx
Joe Biden, people.person.spouse_s, m.04hzwmt
m.07y4vlv, base.yupgrade.user.topics, Joe Biden
m.0fpl74d, people.place_lived.person, Joe Biden
Joe Biden, people.person.nationality, United States of America
Good Morning America, base.yupgrade.user.topics, Joe Biden
Joe Biden, business.board_member.leader_of, m.011s5qnh
Naomi Biden, people.person.parents, Joe Biden
Scranton, location.location.people_born_here, Joe Biden
m.02_x98d, government.political_party_tenure.politician, Joe Biden
Joe Biden, royalty.chivalric_order_member.belongs_to_order, m.0g9krw1
Joe Biden, government.politician.election_campaigns, Joe Biden vice-presidential campaign, 2012
Joe Biden, government.u_s_congressperson.thomas_id, B000444
PERSON TYPE, community.discussion_thread.topic, Joe Biden
m.04hzwly, people.marriage.spouse, Joe Biden
m.010r243f, event.speech_or_presentation.type_or_format_of_presentation, Speech
m.052n2bm, business.employment_tenure.person, Joe Biden
Joe Biden, people.person.places_lived, m.03pr98t
Barack Obama, government.us_president.vice_president, Joe Biden
Joe Biden, people.person.religion, Catholicism
m.02_x99k, government.legislative_committee_membership.member, Joe Biden
Joe Biden, people.person.sibling_s, m.04hzwgr
Joe Biden, american_football.football_player.position_s, Defensive back
g.11b8cfq9yc, education.education.student, Joe Biden
Joe Biden, celebrities.celebrity.celebrity_rivals, m.04wkvd9
Politician, people.profession.people_with_this_profession, Joe Biden
Irish American, people.ethnicity.people, Joe Biden
Public speaking event, freebase.type_hints.included_types, Event
Sword Beach, location.location.containedby, Ouistreham
Joe Biden, sports.pro_athlete.sports_played_professionally, m.0d6m0bj
Joe Biden, book.author.openlibrary_id, OL3506380A
Ashley Biden, people.person.parents, Joe Biden
m.0pb_gp2, film.personal_film_appearance.person, Joe Biden
m.03l4lnr, education.education.student, Joe Biden
Joe Biden, people.person.education, g.11b8cfq9yc
White House Situation Room during Operation Neptune's Spear, visual_art.artwork.art_subject, Joe Biden
m.04hzwhy, people.place_lived.person, Joe Biden
m.03pr98t, people.place_lived.person, Joe Biden
Event, freebase.type_profile.strict_included_types, Non-Agent
2008 Democratic National Convention, base.politicalconventions.political_convention.vice_presidential_nominee, Joe Biden
m.09vj0kt, base.yupgrade.user.topics, Joe Biden
Joe Biden, government.politician.election_campaigns, Joe Biden presidential campaign, 2008
Joe Biden, people.person.place_of_birth, Scranton
70th anniversary of D-Day and the Battle of Normandy, time.event.locations, Sword Beach
m.07y524n, base.yupgrade.user.topics, Joe Biden
Promises to keep, book.written_work.author, Joe Biden
United States vice-presidential debate, 2008, base.culturalevent.event.entity_involved, Joe Biden
Joe Biden, government.us_vice_president.to_president, Barack Obama
Joe Biden, people.person.ethnicity, Irish American
Joe Biden, government.politician.government_positions_held, m.04s_v0l
m.0527kzw, government.government_position_held.appointed_by, Joe Biden
m.09sq8_9, base.yupgrade.user.topics, Joe Biden
Joe Biden, event.public_speaker.speeches_or_presentations, m.05v4mjh
Joe Biden, government.politician.legislative_committees_served_on, m.02_x99b
m.0g9krw1, royalty.chivalric_order_membership.recipient, Joe Biden
Joe Biden, people.person.education, m.03l4lnx
m.05x23d5, dataworld.gardening_hint.replaced_by, Joe Biden
Sword Beach, common.topic.notable_types, Location
70th anniversary of D-Day and the Battle of Normandy, event.public_speaking_event.speech_presentation_discussion, m.010r243f
Joe Biden, film.person_or_entity_appearing_in_film.films, m.011sx3x0
m.0g9krt9, royalty.chivalric_order_membership.recipient, Joe Biden
m.04j00l_, base.politicalconventions.convention_speech.speaker, Joe Biden
Joe Biden vice-presidential campaign, 2012, government.election_campaign.candidate, Joe Biden
Public speaking event, type.type.expected_by, Event
Joe Biden, people.person.children, Beau Biden
Joe Biden, government.politician.legislative_committees_served_on, m.02_x99k
m.04hzwmt, people.marriage.spouse, Joe Biden
Hunter Biden, people.person.parents, Joe Biden
Joe Biden, imdb.topic.name_id, nm0081182
Public speaking event, type.type.properties, Speech, presentation, discussion
70th anniversary of D-Day and the Battle of Normandy, common.topic.notable_types, Public speaking event
Joe Biden vice-presidential campaign, 2008, government.election_campaign.candidate, Joe Biden
Joe Biden, people.person.places_lived, m.0fpl74d
Joe Biden, people.person.children, Hunter Biden
Joe Biden, book.author.works_written, Promises to keep
Sword Beach, location.location.containedby, Saint-Aubin-sur-Mer, Calvados
Joe Biden, film.person_or_entity_appearing_in_film.films, m.0pb_gp2
m.0hpnx72, sports.sports_team_roster.player, Joe Biden
m.04hzwh1, people.sibling_relationship.sibling, Joe Biden
Sword Beach, common.topic.notable_for, g.125549vm0
Joe Biden, fictional_universe.fictional_character.based_on, Joe Biden
Joe Biden, people.person.profession, Politician
m.06h_8hr, base.yupgrade.user.topics, Joe Biden
Sword Beach, common.topic.article, m.0q4tp
California Proposition 8, base.propositions.proposition.against, Joe Biden
Joseph R. Biden Sr., people.person.children, Joe Biden
Public speaking event, type.type.expected_by, Session
Joe Biden, people.person.parents, Joseph R. Biden Sr.
Joe Biden, people.person.gender, Male
White people, people.ethnicity.people, Joe Biden
Joe Biden, people.person.education, m.03l4lnr
m.04hzwhc, people.sibling_relationship.sibling, Joe Biden
Event, type.type.domain, Event
m.09vj0kh, base.yupgrade.user.topics, Joe Biden
Joe Biden, base.obamabase.cabinet_member.cabinet_position, Vice President of the United States
Barack Obama 2009 presidential inauguration, base.culturalevent.event.entity_involved, Joe Biden
Anderson Cooper, base.yupgrade.user.topics, Joe Biden
Joe Biden, government.political_appointer.appointees, m.0527kzw
m.02_x99b, government.legislative_committee_membership.member, Joe Biden
Joe Biden, base.politicalconventions.convention_speaker.conventions_spoken_at, m.04j00l_
Public speaking event, freebase.type_hints.included_types, Topic
m.0fpwg82, base.popstra.restaurant_choice.diner, Joe Biden
m.010r243f, event.speech_or_presentation.speaker_s, Barack Obama
Newsweek, base.yupgrade.user.topics, Joe Biden
m.04wkvd9, celebrities.rivalry.rival, Joe Biden
m.09vj0k5, base.yupgrade.user.topics, Joe Biden
Public speaking event, freebase.type_profile.strict_included_types, Topic
United States presidential election debates, 2012, time.event.people_involved, Joe Biden
Joe Biden, government.politician.election_campaigns, Joe Biden vice-presidential campaign, 2008
m.0qm9j83, dataworld.gardening_hint.last_referenced_by, Joe Biden
m.0wzhzlx, film.personal_film_appearance.person, Joe Biden
m.09vj0jk, base.yupgrade.user.topics, Joe Biden
Joe Biden, government.politician.legislative_committees_served_on, m.02_x991
Joe Biden, people.person.education, m.04hzwkj
Catherine Eugenia Finnegan, people.person.children, Joe Biden
m.010r243f, event.public_speaker.speeches_or_presentations, Barack Obama
Sword Beach, location.location.geolocation, m.02_rmgn
Joe Biden, user.robert.default_domain.daylife.hero_image_id, 05Ic4qp7KV80M
m.0d6m0bj, sports.pro_sports_played.athlete, Joe Biden
Public speaking event, type.type.domain, Event

Answer: Joe Biden