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: who was the president of the united states during ww2? 
Knowledge Triplets: Lyndon B. Johnson, people.person.nationality, United States of America
D-Day: 40 Years Later, radio.radio_program.subjects, World War II
American Theater, base.culturalevent.event.entity_involved, Allies of World War II
World War II montage image, common.image.size, m.02dts2j
United States Navy operations during World War I, time.event.locations, Mediterranean Sea
World War II, military.military_conflict.commanders, m.0w5q2sz
m.09w7qyh, common.webpage.topic, World War II
Adolf Hitler, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.webpage, m.0b45zcq
World War II, common.topic.webpage, m.09wl5j0
m.09xwgl8, common.webpage.topic, World War II
World War II, time.event.locations, Pacific Ocean
World War II montage image, common.image.appears_in_topic_gallery, 1940s
World War II, base.jewlib.jewish_studies_field.collections, Holocaust Era Assets
World War II, base.jewlib.jewish_studies_field.collections, Footnote.com - Holocaust Collection
m.02h7np1, military.military_command.military_conflict, World War II
World War II, base.disaster2.state_of_emergency.declarations, m.066bkv5
m.05rln07, event.speech_or_presentation.speaker_s, Franklin D. Roosevelt
World War II, base.ontologies.ontology_instance.equivalent_instances, m.09klnbh
m.09ysx61, common.webpage.topic, World War II
m.09yggz2, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09y5hqr
Dwight D. Eisenhower, military.military_commander.military_commands, m.04h_hmh
Dwight D. Eisenhower, people.person.nationality, United States of America
World War II, military.military_command.military_conflict, m.04jx14r
m.05rnk1w, event.speech_or_presentation.speech_topic, World War II
World War II, base.morelaw.war.peace_treaty, Treaty of San Francisco
World War II, base.morelaw.war.peace_treaty, Armistice of Cassibile
World War II, base.morelaw.war.peace_treaty, Atlantic Charter
May 10-1940 Germany Invades Holland!, common.topic.subjects, World War II
m.010nmtv6, event.speech_or_presentation.speech_topic, World War II
World War II, base.morelaw.war.peace_treaty, Treaty of Vis
Remembering Robert S. McNamara through 'The Fog of War', common.resource.annotations, m.09ygfz9
World War II, common.topic.notable_types, Military Conflict
World War II, common.topic.webpage, m.09x5b2d
m.059b7cc, military.military_command.military_conflict, World War II
World War II, military.military_conflict.commanders, m.02h7nn7
Charles de Gaulle, military.military_person.participated_in_conflicts, World War I
World War II, military.military_conflict.commanders, m.0w5q83x
m.0b48dsf, common.webpage.topic, World War II
m.0b45zcq, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.02h7nmf
World War II, military.military_conflict.casualties, m.02h7nq3
The War Illustrated, book.periodical.subjects, World War II
m.09wgp4k, common.webpage.topic, World War II
World War II, time.event.locations, Africa
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rln07
World War II, common.topic.webpage, m.09ydx3t
Maurice Gamelin, military.military_person.participated_in_conflicts, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Joseph Stalin
World War II, military.military_conflict.commanders, m.010_09yn
World War II, common.topic.webpage, m.09xyz9p
m.02h7nqf, military.casualties.military_conflict, World War II
m.04jx14r, military.military_command.military_conflict, World War II
m.09ybsfr, common.webpage.topic, World War II
World War II, tv.tv_subject.tv_programs, Anne Frank: The Whole Story
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_types, Exhibition
World War II, common.topic.image, World War II montage image
Franklin D. Roosevelt, government.us_president.vice_president, Harry S. Truman
World War II, common.topic.subject_of, The Price of the Victory
Allies of World War II, military.military_combatant.casualties, m.02h7npm
Action of 5 July 1942, time.event.included_in_event, World War II
World War II, common.topic.webpage, m.09y0608
World War II, military.military_conflict.commanders, m.059b7cc
World War II, common.topic.webpage, m.09w9d_p
World War II, common.topic.webpage, m.09wxv0j
World War II, military.military_conflict.commanders, m.0w5t9rt
World War II, common.topic.webpage, m.09xwgl8
m.09wwvtm, common.webpage.topic, World War II
m.09yfzdj, common.webpage.topic, World War II
1940s, common.topic.image, World War II montage image
m.05rpn5h, event.speech_or_presentation.speech_topic, World War II
World War II, military.military_conflict.commanders, m.02h7nmz
m.04jx14r, military.military_commander.military_commands, Harry S. Truman
m.09ydx3t, common.webpage.topic, World War II
m.09xyz9p, common.webpage.topic, World War II
WW2Montage, common.image.appears_in_topic_gallery, Exercise Tiger
World War II, book.periodical_subject.periodicals, The War Illustrated
World War II, military.military_conflict.commanders, m.0y7_lvp
m.09xq5z0, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rnk1w
World War II, common.topic.webpage, m.0b475k_
m.09yybjl, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09w7nt9
Lyndon B. Johnson, military.military_person.participated_in_conflicts, World War II
m.04g9ywq, military.military_combatant_group.conflict, World War II
World War II, time.event.locations, Russia
World War II, military.military_conflict.commanders, m.0w5t225
World War II, time.event.locations, Europe
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.010nmtv6
m.09xss79, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5s7wq
World War II, time.event.instance_of_recurring_event, World war
m.09ys_2c, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rpn5h
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Dwight D. Eisenhower
World War I, common.topic.image, WW1 TitlePicture For Wikipedia Article
m.0b48g2t, common.webpage.topic, World War II
World War II, radio.radio_subject.programs_with_this_subject, Lost Innocence: The Children of World War II
World War II, base.jewlib.jewish_studies_field.collections, German War Crime Records
World War II, military.military_conflict.combatants, m.04g9ywq
Adolf Hitler, military.military_commander.military_commands, m.02h7nns
World War II, military.military_conflict.casualties, m.02h7nrd
World War II, common.topic.webpage, m.09xrmvz
m.0w5t9rt, military.military_command.military_conflict, World War II
World War II, tv.tv_subject.tv_programs, Band of Brothers
World War II, common.topic.webpage, m.09ys_2c
Edward Rydz-Śmigły, military.military_person.participated_in_conflicts, World War I
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_for, g.125fv4np3
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmrf2
Living with the Dead: W. Eugene Smith and World War II, common.topic.image, freebase ex dead.jpg
World War II, common.topic.webpage, m.09wgp7j
United States Navy operations during World War I, base.culturalevent.event.entity_involved, United States of America
World War II, common.topic.subject_of, Text and Meaning in Albert Camus' The Myth of Sisyphus
m.09w7nt9, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09x_3c3
United States Navy operations during World War I, common.topic.notable_types, Military Conflict
World War II, common.topic.webpage, m.09x7jp_
m.0b6rtrx, common.webpage.topic, World War II
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, Vietnam War
World War II, base.morelaw.war.peace_treaty, Moscow Peace Treaty
Vietnam War, base.culturalevent.event.entity_involved, Lyndon B. Johnson
Great Patriotic War, time.event.included_in_event, World War II
World War II, military.military_conflict.commanders, m.02h77t6
Carl Gustaf Emil Mannerheim, military.military_person.participated_in_conflicts, World War II
World War II, tv.tv_subject.tv_episode_segments, The Funniest Joke in the World
World War II, base.morelaw.war.peace_treaty, Franco-Polish alliance
m.02h7nqp, military.casualties.military_conflict, World War II
Władysław Anders, military.military_person.participated_in_conflicts, World War II
Gerald Ford, military.military_person.participated_in_conflicts, World War II
World War II, time.event.included_in_event, 1940s
World War II, base.morelaw.war.peace_treaty, Franco-Soviet Treaty of Mutual Assistance
Franklin D. Roosevelt, people.person.nationality, United States of America
Josip Broz Tito, military.military_person.participated_in_conflicts, World War II
Allies of World War II, military.military_combatant.includes_allies, United States of America
World War II, common.topic.article, m.081q5
World War II, common.topic.webpage, m.09y6kxc
m.09wgp7j, common.webpage.topic, World War II
Living with the Dead: W. Eugene Smith and World War II, common.topic.webpage, m.04lmj_d
Lost Innocence: The Children of World War II, broadcast.content.artist, Timothy Findlay
m.05rmlhb, event.speech_or_presentation.speech_topic, World War II
Władysław Sikorski, military.military_person.participated_in_conflicts, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Adolf Hitler
20th century, common.topic.image, WW1 TitlePicture For Wikipedia Article
World War II, base.schemastaging.context_name.pronunciation, g.125_qbg06
m.043wps7, military.casualties.military_conflict, World War II
World War II, common.topic.webpage, m.0b49czw
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War II
Charles de Gaulle, military.military_person.participated_in_conflicts, World War II
m.02h7nrd, military.casualties.military_conflict, World War II
m.09wsxxn, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmlhb
Nuremberg Charter, base.morelaw.peace_treaty.ends_war, World War II
m.0b46p4g, common.webpage.topic, World War II
George S. Patton, military.military_person.participated_in_conflicts, World War II
m.09xr1l4, common.webpage.topic, World War II
1940s, time.event.includes_event, World War II
Living with the Dead: W. Eugene Smith and World War II, common.topic.article, m.04lmj_t
World War II, common.topic.webpage, m.09wwp1v
World War II, common.topic.webpage, m.09y4ljx
Franklin D. Roosevelt, event.public_speaker.speeches_or_presentations, m.05rln07
World War II, common.topic.webpage, m.0b48g2t
World War II, common.topic.webpage, m.09xxnlt
World War II, military.military_conflict.commanders, m.02h7npb
Lyndon B. Johnson, military.military_commander.military_commands, m.02h77t6
World War II, base.morelaw.war.peace_treaty, Moscow Declarations
m.09ygg0r, common.webpage.topic, World War II
m.0w5r8rm, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09w7qyh
m.0b49cc7, common.webpage.topic, World War II
World War II, base.skosbase.vocabulary_equivalent_topic.narrower_concept, World War, 1939-1945--Hostages
World War II, base.morelaw.war.peace_treaty, Paris Peace Treaties, 1947
World War II, common.topic.webpage, m.09yj2jt
Operation White, time.event.included_in_event, World War II
m.09y0608, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09w41xr
m.09yvl19, common.webpage.topic, World War II
Remembering Robert S. McNamara through 'The Fog of War', common.resource.annotations, m.09ygg0r
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmf82
World War II, military.military_conflict.commanders, m.02h7np1
m.02h7nq3, military.casualties.military_conflict, World War II
m.02923_6, common.image.appears_in_topic_gallery, World War II
m.066bks3, base.disaster2.state_of_emergency_declaration.event, World War II
m.04lmj_d, common.webpage.topic, Living with the Dead: W. Eugene Smith and World War II
m.09y9l5w, common.webpage.topic, World War II
World War II, base.morelaw.war.peace_treaty, Sino-American Cooperative Organization
World War II, time.event.locations, Scandinavia
World War II, time.event.locations, Asia
World War II, common.topic.webpage, m.09xr1l4
m.02h7npw, military.casualties.combatant, Allies of World War II
m.09wsrnl, common.webpage.topic, World War II
World War II, common.topic.notable_for, g.125500wpl
m.0478pm4, military.military_command.military_conflict, World War II
World War II, base.disaster2.state_of_emergency.declarations, m.066bks3
m.09wwp1v, common.webpage.topic, World War II
Allies of World War II, military.military_combatant.casualties, m.02h7nq3
World War II, common.topic.webpage, m.09xss79
American Theater, time.event.included_in_event, World War II
World War II, common.topic.webpage, m.0b48dsf
m.05rln07, event.speech_or_presentation.speaker_s, Franklin D. Roosevelt
World War II, time.event.locations, Atlantic Ocean
World War II, common.topic.image, m.02923_6
m.04lmk01, exhibitions.exhibition_run.exhibition, Living with the Dead: W. Eugene Smith and World War II
Harry S. Truman, government.us_vice_president.to_president, Franklin D. Roosevelt
World War II, base.argumentmaps.discovery.original_idea, P-38 can opener
World War II, base.morelaw.war.peace_treaty, Pact of Steel
World War II, common.topic.webpage, m.09xgynp
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War I
World War II, military.military_conflict.commanders, m.0w5r8rm
m.0w5s7wq, military.military_command.military_conflict, World War II
m.02h7npw, military.casualties.military_conflict, World War II
m.063vhkn, base.nobelprizes.nobel_honor.subject_area, World War II
Allies of World War II, common.topic.image, m.02923_6
Anne Frank: The Whole Story, tv.tv_program.subjects, World War II
m.09x773p, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rm8xf
Action of 6 October 1944, time.event.included_in_event, World War II
World War II, time.event.locations, Southeast Asia
World War II, common.topic.webpage, m.0b49cc7
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.exhibition_types, Photography exhibition
World War II, military.military_conflict.commanders, m.0478pm4
Harry S. Truman, military.military_person.participated_in_conflicts, World War I
World War II, radio.radio_subject.programs_with_this_subject, D-Day: 40 Years Later
Tadeusz Bór-Komorowski, military.military_person.participated_in_conflicts, World War II
m.09x5b2d, common.webpage.topic, World War II
m.05rm8xf, event.speech_or_presentation.speech_topic, World War II
m.05rmrf2, event.speech_or_presentation.speech_topic, World War II
World War II, military.military_conflict.casualties, m.02h7npw
WW2Montage, common.image.appears_in_topic_gallery, World War II
World War II, common.topic.webpage, m.09x4cx1
m.02h7nmz, military.military_command.military_conflict, World War II
m.02h7npm, military.casualties.combatant, Allies of World War II
Harry S. Truman, people.person.nationality, United States of America
United States of America, military.military_combatant.belongs_to_combatant_group, Allies of World War II
m.02h7nmf, military.military_command.military_conflict, World War II
World War II, base.morelaw.war.peace_treaty, Nuremberg Charter
m.09xrmvz, common.webpage.topic, World War II
Maurice Gamelin, military.military_person.participated_in_conflicts, World War I
World War II, military.military_conflict.casualties, m.043wpsh
World War II, military.military_conflict.commanders, m.0w5qcxy
World War II, common.topic.webpage, m.09y8d_t
m.05rmf82, event.speech_or_presentation.speech_topic, World War II
Allies of World War II, military.military_combatant.casualties, m.02h7npw
m.09x7jp_, common.webpage.topic, World War II
m.09yjnz5, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09wsrnl
Archibald Wavell, 1st Earl Wavell, military.military_person.participated_in_conflicts, World War II
m.0w5q2sz, military.military_command.military_conflict, World War II
Chiang Kai-shek, military.military_person.participated_in_conflicts, World War II
m.09y2gbs, common.webpage.topic, World War II
m.0w5sb93, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09wgp4k
World War II, common.topic.webpage, m.0b46rff
World War II, base.morelaw.war.peace_treaty, Tripartite Pact
World War II, common.topic.webpage, m.09wwvtm
World War II, military.military_conflict.commanders, m.02h7nns
United States Navy operations during World War I, time.event.locations, Pacific Ocean
World War II, common.topic.webpage, m.09xq5z0
World War II, common.topic.webpage, m.09wsxxn
WW2Montage, common.image.size, m.04246bq
World War II, common.topic.webpage, m.09yggz2
World War II, base.jewlib.jewish_studies_field.collections, WWII Nuremburg Interrogation Records
World War II montage image, common.image.appears_in_topic_gallery, World War II
World War II, military.military_conflict.commanders, m.0w5sb93
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Benito Mussolini
m.09wxv0j, common.webpage.topic, World War II
m.043wpsh, military.casualties.military_conflict, World War II
m.09y6kxc, common.webpage.topic, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Archibald Wavell, 1st Earl Wavell
m.02923_6, common.image.appears_in_topic_gallery, Allies of World War II
World War II, time.event.locations, Mediterranean Sea
World War II, common.topic.webpage, m.0b46p4g
World War II, exhibitions.exhibition_subject.exhibitions_created_about_this_subject, Living with the Dead: W. Eugene Smith and World War II
Carl Gustaf Emil Mannerheim, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.webpage, m.09ybsfr
World War II, common.topic.webpage, m.09y9l5w
m.09yj2jt, common.webpage.topic, World War II
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.venues, m.04lmk01
World war, time.recurring_event.instances, World War II
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, World War II
World War II, common.topic.webpage, m.09y2gbs
United States Navy operations during World War I, time.event.included_in_event, World War I
World War II, base.jewlib.jewish_studies_field.collections, Mauthausen Death Books
World War II, radio.radio_subject.programs_with_this_subject, The Army Hour
World War II, common.topic.webpage, m.09ysx61
World War II, military.military_conflict.casualties, m.02h7npm
m.02h77t6, military.military_command.military_conflict, World War II
Allies of World War II, military.military_combatant.includes_allies, Russia
World War II, military.military_conflict.commanders, m.04jx14r
World War II, common.topic.webpage, m.09yybjl
World War II, base.morelaw.war.peace_treaty, Tehran Declaration
Allies of World War II, military.military_combatant.includes_allies, United Kingdom
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rln07
Anglo-Soviet Agreement, base.morelaw.peace_treaty.ends_war, World War II
m.010_09yn, military.military_command.military_conflict, World War II
World War II, military.military_conflict.commanders, m.04h_hmh
World War II, military.military_conflict.commanders, m.0w5vmcb
Edward Rydz-Śmigły, military.military_person.participated_in_conflicts, World War II
World War II, military.military_conflict.force_strengths, m.011r9l78
World War II, base.jewlib.jewish_studies_field.collections, Papers of the International Military Tribunal and the Nuremberg Military Tribunals
World War II, base.jewlib.jewish_studies_field.collections, Captured German Records
World War II, military.military_conflict.combatants, m.04g9ysp
m.09y8d_t, common.webpage.topic, World War II
m.0b46rff, common.webpage.topic, World War II
World War II, time.event.locations, Eurasia
United States Navy operations during World War I, time.event.locations, Atlantic Ocean
World War II, base.jewlib.jewish_studies_field.collections, National Archives - Digital Holocaust Records
m.02h7nn7, military.military_command.military_conflict, World War II
World War II, military.military_conflict.commanders, m.02h7nnj
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, W. Eugene Smith
m.09x4cx1, common.webpage.topic, World War II
World War II, base.morelaw.war.peace_treaty, Treaty of Peace with Italy, 1947
World War II, time.event.included_in_event, 20th century
Allies of World War II, military.military_combatant.includes_allies, Soviet Union
Benito Mussolini, military.military_person.participated_in_conflicts, World War II
m.09w41xr, common.webpage.topic, World War II
World War II, time.event.locations, Middle East
World War II, base.nobelprizes.nobel_subject_area.nobel_awards, m.063vhkn
m.02h7nns, military.military_command.military_conflict, World War II
Winston Churchill, military.military_person.participated_in_conflicts, World War I
Action of 10 November 1944, time.event.included_in_event, World War II
World War II, military.military_conflict.casualties, m.02h7nqp
m.09xgynp, common.webpage.topic, World War II
m.0w5qcxy, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.0cqm322
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Charles de Gaulle
World War II, military.military_conflict.casualties, m.02h7nqf
World War II, military.military_conflict.commanders, m.0w5q8n_
World War II, common.topic.webpage, m.09ygg0r
m.09y4ljx, common.webpage.topic, World War II
World War II, common.topic.webpage, m.0b6rtrx
m.02h7nnj, military.military_command.military_conflict, World War II
m.02h7nq3, military.casualties.combatant, Allies of World War II
Action of 23 April 1945, time.event.included_in_event, World War II
m.09y5hqr, common.webpage.topic, World War II
m.09xxnlt, common.webpage.topic, World War II
Władysław Anders, military.military_person.participated_in_conflicts, World War I
m.0w5q83x, military.military_command.military_conflict, World War II
m.05rpn5h, event.speech_or_presentation.speaker_s, Harry S. Truman
World War II, common.topic.webpage, m.09yjnz5
m.09wl5j0, common.webpage.topic, World War II
m.0cqm322, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09yfzdj
World War II, military.military_conflict.casualties, m.043wps7
World War II, common.topic.subject_of, May 10-1940 Germany Invades Holland!
World War II, common.topic.webpage, m.09yvl19
m.09yf8lh, common.webpage.topic, World War II
m.0b475k_, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09yf8lh
World War II, base.morelaw.war.peace_treaty, Anglo-Soviet Agreement
m.05rln07, event.speech_or_presentation.speech_topic, World War II
m.0b49czw, common.webpage.topic, World War II
m.09x_3c3, common.webpage.topic, World War II
m.0w5t225, military.military_command.military_conflict, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rpn5h
m.09w9d_p, common.webpage.topic, World War II
m.02h7npb, military.military_command.military_conflict, World War II
P-38 can opener, base.argumentmaps.original_idea.discovered_during_event, World War II
Benito Mussolini, military.military_person.participated_in_conflicts, World War I
World War II, common.topic.image, WW2Montage
20th century, time.event.includes_event, World War II
m.0w5q8n_, military.military_command.military_conflict, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Josip Broz Tito
World War II, common.topic.webpage, m.09x773p

Answer: Franklin D. Roosevelt
Harry S. Truman