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 Leader of the United States during WWII died on 1945-04-12? 
Knowledge Triplets: Carl Gustaf Emil Mannerheim, military.military_person.participated_in_conflicts, World War II
President of the United States, government.government_office_or_title.office_holders, m.03q2h_9
Adolf Hitler, military.military_commander.military_commands, m.02h7nns
m.09x_3c3, common.webpage.topic, World War II
World War, 1939-1945--Hostages, base.skosbase.skos_concept.broader_topic, Hostage
World War II, common.topic.webpage, m.09ydx3t
World War II, military.military_conflict.casualties, m.02h7npm
m.09wgp4k, common.webpage.topic, World War II
World War II, base.morelaw.war.peace_treaty, Atlantic Charter
m.09y0608, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09xyz9p
World War II montage image, common.image.appears_in_topic_gallery, World War II
m.09w7nt9, common.webpage.topic, World War II
United States of America, people.person.nationality, Franklin D. Roosevelt
World War II, base.morelaw.war.peace_treaty, Sino-American Cooperative Organization
m.09xgynp, common.webpage.topic, World War II
m.0b48dsf, common.webpage.topic, World War II
m.0b475k_, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5qcxy
World War II, time.event.locations, Russia
George S. Patton, military.military_person.participated_in_conflicts, World War II
World War II, base.disaster2.state_of_emergency.declarations, m.066bks3
World War II, event.speech_or_presentation.speech_topic, m.05rln07
m.09ysx61, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5q8n_
President of the United States, common.topic.webpage, m.09ygxjq
World War II, common.topic.webpage, m.0b45zcq
President of the United States, base.firsts.achievement.firsts, m.04wrx4g
m.0478pm4, military.military_command.military_conflict, World War II
World War II, military.military_conflict.combatants, m.04g9ysp
World War II, book.periodical_subject.periodicals, The War Illustrated
m.09wwvtm, common.webpage.topic, World War II
m.09wl5j0, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmf82
World War II, military.military_conflict.commanders, m.02h7nns
World War II, common.topic.webpage, m.09y0608
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Charles Lee
World War, 1939-1945--Hostages, base.skosbase.skos_concept.in_scheme, Topical Terms Concept Scheme
United States of America, military.military_combatant.casualties, m.043wpsh
m.09ybsfr, common.webpage.topic, World War II
1940s, common.topic.image, World War II montage image
World War II, common.topic.webpage, m.09xq5z0
President of the United States, base.firsts.achievement.firsts, m.08ntjg4
President of the United States, common.topic.webpage, m.05ckhcc
World War II, base.jewlib.jewish_studies_field.collections, National Archives - Digital Holocaust Records
World War II, military.military_conflict.commanders, m.04h_hmh
Living with the Dead: W. Eugene Smith and World War II, common.topic.webpage, m.04lmj_d
World War II, military.military_conflict.commanders, m.04jx14r
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_types, Exhibition
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.subjects, Politics of the United States
Gerald Ford, military.military_person.participated_in_conflicts, World War II
m.09yf8lh, common.webpage.topic, World War II
m.09w7qyh, common.webpage.topic, World War II
United States Navy operations during World War I, time.event.included_in_event, World War I
m.09wgp7j, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5s7wq
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmrf2
m.066bkv5, base.disaster2.state_of_emergency_declaration.event, World War II
Tadeusz Bór-Komorowski, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.0b475k_
m.04lmk01, exhibitions.exhibition_run.exhibition, Living with the Dead: W. Eugene Smith and World War II
Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush, book.written_work.subjects, President of the United States
m.02h7nrd, military.casualties.military_conflict, World War II
George Washington, first President of the United States, common.image.size, m.02f0j1t
World War II, time.event.locations, Scandinavia
World War II, radio.radio_subject.programs_with_this_subject, The Army Hour
m.09xxnlt, common.webpage.topic, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rpn5h
World War II, common.topic.webpage, m.09y9l5w
World War II, time.event.instance_of_recurring_event, World war
Archibald Wavell, 1st Earl Wavell, military.military_person.participated_in_conflicts, World War II
World War II, military.military_conflict.casualties, m.02h7nqp
Living with the Dead: W. Eugene Smith and World War II, common.topic.article, m.04lmj_t
World War II, common.topic.webpage, m.09xgynp
President of the United States, book.book_subject.works, Presidential Leadership: Rating the Best and the Worst in the White House
World War II, military.military_conflict.force_strengths, m.011r9l78
World War II, common.topic.webpage, m.09x5b2d
World War II, military.military_conflict.commanders, m.02h7nnj
World War, 1939-1945--Hostages, base.skosbase.skos_concept.in_scheme, Authorities Concept Scheme
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, President Thomas Westwood
m.09yvl19, common.webpage.resource, Stephen King on J.D. Salinger: 'The last of the great post-WWII American writers'
World War II, base.morelaw.war.peace_treaty, Nuremberg Charter
World War II, base.nobelprizes.nobel_subject_area.nobel_awards, m.063vhkn
World War II, common.topic.webpage, m.09w41xr
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, W. Eugene Smith
m.059b7cc, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09wwp1v
Lyndon B. Johnson, military.military_person.participated_in_conflicts, World War II
World War II, base.morelaw.war.peace_treaty, Armistice of Cassibile
1940s, common.topic.webpage, m.09y8qv3
1940s, time.event.includes_event, World War II
World War II, base.morelaw.war.peace_treaty, Tripartite Pact
World War II, common.topic.webpage, m.09wxv0j
United States of America, military.military_combatant.belongs_to_combatant_group, Allies of World War II
m.0w5s7wq, military.military_command.military_conflict, World War II
m.02h7nnj, military.military_command.military_conflict, World War II
World War II, base.morelaw.war.peace_treaty, Franco-Polish alliance
Harry S. Truman, military.military_person.participated_in_conflicts, World War I
President of the United States, common.topic.webpage, m.09w6pyk
1940s, time.event.includes_event, Cold War
m.09xss79, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09y4ljx
World War II, military.military_conflict.commanders, m.0478pm4
World War II, common.topic.webpage, m.09yvl19
World War II, military.military_conflict.commanders, m.0w5t225
World War II, common.topic.webpage, m.09yfzdj
President of the United States, common.topic.webpage, m.09y93hy
World War II, military.military_conflict.commanders, m.02h7np1
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Benito Mussolini
World War II, military.military_conflict.commanders, m.0y7_lvp
Allies of World War II, military.military_combatant.includes_allies, United Kingdom
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Joseph Stalin
US President, common.topic.notable_types, Franklin D. Roosevelt
World War II, common.topic.image, World War II montage image
m.02923_6, common.image.appears_in_topic_gallery, World War II
1940s, common.topic.webpage, m.09y8qdv
World War II, military.military_conflict.commanders, m.0w5sb93
m.02h7nn7, military.military_command.military_conflict, World War II
m.09yggz2, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.010_09yn
m.05rln07, event.speech_or_presentation.speaker_s, Franklin D. Roosevelt
Josip Broz Tito, military.military_person.participated_in_conflicts, World War II
World War II, visual_art.art_subject.artwork_on_the_subject, Dying Soldier
m.09w9d_p, common.webpage.topic, World War II
World War II montage image, common.image.appears_in_topic_gallery, 1940s
World War II, common.topic.webpage, m.09yf8lh
President of the United States, common.topic.webpage, m.0663zsk
World War II, radio.radio_subject.programs_with_this_subject, Lost Innocence: The Children of World War II
World War II, time.event.locations, Eurasia
World War II, common.topic.subject_of, May 10-1940 Germany Invades Holland!
m.02h7npw, military.casualties.combatant, Allies of World War II
Allies of World War II, military.military_combatant.casualties, m.02h7npm
World War II, common.topic.webpage, m.0b6rtrx
World War II, common.topic.webpage, m.09wwvtm
m.09x5b2d, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09x4cx1
m.0b45zcq, common.webpage.topic, World War II
Adolf Hitler, people.person.profession, Soldier
Great Patriotic War, time.event.included_in_event, World War II
Richard Nixon, military.military_person.participated_in_conflicts, World War II
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rmlhb
m.02923_6, common.image.appears_in_topic_gallery, Allies of World War II
President of the United States, common.topic.webpage, m.09y9g34
World War II, common.topic.webpage, m.09xss79
World War II, military.military_conflict.combatants, m.04g9ywq
World War II, common.topic.webpage, m.09xr1l4
m.0b49cc7, common.webpage.topic, World War II
George H. W. Bush, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09y2gbs
Allies of World War II, military.military_combatant.casualties, m.02h7nq3
President of the United States, common.topic.webpage, m.09wvy_x
President of the United States, common.topic.webpage, m.09xm31x
WW2Montage, common.image.appears_in_topic_gallery, World War II
President of the United States, base.ontologies.ontology_class.equivalent_classes, m.0dj2gvv
World War II, common.topic.webpage, m.09ysx61
Władysław Sikorski, military.military_person.participated_in_conflicts, World War II
m.09xwgl8, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09yjnz5
World War II, common.topic.image, WW2Montage
World War, 1939-1945--Hostages, base.skosbase.skos_concept.broader_topic, World War II
John F. Kennedy, military.military_person.participated_in_conflicts, World War II
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Powers of the President of the United States
United States Navy operations during World War I, time.event.locations, Mediterranean Sea
World War II, exhibitions.exhibition_subject.exhibitions_created_about_this_subject, Living with the Dead: W. Eugene Smith and World War II
m.043wps7, military.casualties.military_conflict, World War II
World War II, military.military_conflict.casualties, m.02h7nrd
World War II, common.topic.webpage, m.09yj2jt
World War II, military.military_conflict.casualties, m.02h7nq3
President of the United States, base.schemastaging.context_name.plural, m.0w0qt9b
World War II, military.military_conflict.commanders, m.02h7npb
m.09ys_2c, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09w7qyh
Adolf Hitler, military.military_person.participated_in_conflicts, World War I
George Washington, first President of the United States, common.image.appears_in_topic_gallery, George Washington
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Dwight D. Eisenhower
m.09x773p, common.webpage.topic, World War II
George Washington, first President of the United States, common.image.appears_in_topic_gallery, The Imperial Presidency
George S. Patton, people.person.nationality, United States of America
World War II, radio.radio_subject.programs_with_this_subject, D-Day: 40 Years Later
World War II, base.morelaw.war.peace_treaty, Treaty of San Francisco
United States Navy operations during World War I, common.topic.notable_types, Military Conflict
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.exhibition_types, Photography exhibition
m.04lmj_d, common.webpage.topic, Living with the Dead: W. Eugene Smith and World War II
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War II
Władysław Anders, military.military_person.participated_in_conflicts, World War II
President of the United States, base.firsts.achievement.firsts, m.04xdfjz
World War II, base.ontologies.ontology_instance.equivalent_instances, m.09klnbh
World War II, time.event.locations, Pacific Ocean
World War II, common.topic.webpage, m.09ys_2c
m.02h7nqp, military.casualties.military_conflict, World War II
President of the United States, book.book_subject.works, Presidential Command: Power, Leadership, and the Making of Foreign Policy from Richard Nixon to George W. Bush
World War II, common.topic.webpage, m.09ygg0r
m.0b48g2t, common.webpage.topic, World War II
World War II, time.event.locations, Africa
m.09xrmvz, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5q83x
World War II, base.morelaw.war.peace_treaty, Anglo-Soviet Agreement
World War II, military.military_conflict.commanders, m.059b7cc
World War II montage image, common.image.size, m.02dts2j
World War II, common.topic.webpage, m.09wgp4k
Adolf Hitler, people.deceased_person.place_of_death, Berlin
World War II, military.military_conflict.commanders, m.02h7nmf
World War II, military.military_conflict.commanders, m.0w5vmcb
World War II, military.military_conflict.casualties, m.043wpsh
m.0b49czw, common.webpage.topic, World War II
United States Navy operations during World War I, base.culturalevent.event.entity_involved, United States of America
World war, time.recurring_event.instances, World War II
m.09y5hqr, common.webpage.topic, World War II
World War II, common.topic.webpage, m.0b46p4g
United States Navy operations during World War I, time.event.locations, Atlantic Ocean
m.09wxv0j, common.webpage.topic, World War II
World War II, military.military_conflict.casualties, m.02h7npw
m.02h7nq3, military.casualties.combatant, Allies of World War II
Charles de Gaulle, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09w9d_p
m.0cqm322, common.webpage.topic, World War II
World War II, common.topic.webpage, m.0cqm322
President of the United States, book.book_subject.works, The American Leadership Tradition: Moral Vision from Washington to Clinton
World War II, common.topic.notable_types, Military Conflict
m.09w41xr, common.webpage.topic, World War II
m.09yvl19, common.webpage.topic, World War II
World War II, military.military_conflict.casualties, m.043wps7
m.02h77t6, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09wsrnl
World War II, common.topic.webpage, m.09ybsfr
President of the United States, book.book_subject.works, President Pennybaker
World War II, time.event.locations, Middle East
World War II, common.topic.webpage, m.0b48g2t
m.09y2gbs, common.webpage.topic, World War II
World War II, time.event.locations, Atlantic Ocean
D-Day: 40 Years Later, radio.radio_program.subjects, World War II
m.09wsxxn, common.webpage.topic, World War II
President of the United States, base.firsts.achievement.firsts, m.04wrwjv
World War II, military.military_conflict.casualties, m.02h7nqf
World War II, common.topic.subject_of, The Price of the Victory
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.venues, m.04lmk01
World War II, military.military_conflict.commanders, m.02h77t6
World War II, base.jewlib.jewish_studies_field.collections, WWII Nuremburg Interrogation Records
Stephen King on J.D. Salinger: 'The last of the great post-WWII American writers', common.resource.annotations, m.09yvl19
m.0b46rff, common.webpage.topic, World War II
20th century, time.event.includes_event, World War II
Living with the Dead: W. Eugene Smith and World War II, common.topic.notable_for, g.125fv4np3
m.0b6rtrx, common.webpage.topic, World War II
World War I, base.culturalevent.event.entity_involved, Woodrow Wilson
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rln07
World War II, common.topic.webpage, m.0b46rff
Edward Rydz-Śmigły, military.military_person.participated_in_conflicts, World War II
m.09wwp1v, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09xwgl8
m.043wpsh, military.casualties.military_conflict, World War II
World War II, common.topic.webpage, m.09xxnlt
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War I
President of the United States, common.topic.article, m.060dd
World War II, common.topic.webpage, m.09xrmvz
m.02h7nns, military.military_command.military_commander, Adolf Hitler
m.09xr1l4, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09w7nt9
President of the United States, common.topic.webpage, m.04lsvx0
Living with the Dead: W. Eugene Smith and World War II, common.topic.image, freebase ex dead.jpg
m.0b46p4g, common.webpage.topic, World War II
United States Navy operations during World War I, time.event.locations, Pacific Ocean
m.09yjnz5, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09yybjl
World War II, common.topic.webpage, m.0b49czw
President of the United States, book.book_subject.works, The Sound of Leadership: Presidential Communication in the Modern Age
Benito Mussolini, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09y5hqr
World War II, common.topic.webpage, m.09x_3c3
m.0w5r8rm, military.military_command.military_conflict, World War II
m.09ygg0r, common.webpage.topic, World War II
Allies of World War II, military.military_combatant.includes_allies, United States of America
World War II, common.topic.webpage, m.09x7jp_
World War II, common.topic.notable_for, g.125500wpl
Maurice Gamelin, military.military_person.participated_in_conflicts, World War II
Adolf Hitler, people.deceased_person.cause_of_death, Suicide
Cold War, time.event.included_in_event, 1940s
World War II, military.military_conflict.commanders, m.0w5q2sz
World War II, tv.tv_subject.tv_programs, Anne Frank: The Whole Story
m.02h7nq3, military.casualties.military_conflict, World War II
Allies of World War II, military.military_combatant.casualties, m.02h7npw
m.02h7npm, military.casualties.combatant, Allies of World War II
World War II, base.disaster2.state_of_emergency.declarations, m.066bkv5
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.010nmtv6
m.09x7jp_, common.webpage.topic, World War II
President of the United States, common.topic.webpage, m.0b464_j
President of the United States, common.topic.webpage, m.0b46f7h
m.010_09yn, military.military_command.military_conflict, World War II
World War II, common.topic.webpage, m.09wgp7j
May 10-1940 Germany Invades Holland!, common.topic.subjects, World War II
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Charles de Gaulle
m.09y6kxc, common.webpage.topic, World War II
1940s, common.topic.webpage, m.09y8q62
World War II, base.morelaw.war.peace_treaty, Pact of Steel
Winston Churchill, military.military_person.participated_in_conflicts, World War I
President of the United States, government.government_office_or_title.jurisdiction, United States of America
m.09xyz9p, common.webpage.topic, World War II
World War II, military.military_conflict.commanders, m.0w5r8rm
World War II, common.topic.image, m.02923_6
m.09y9l5w, common.webpage.topic, World War II
m.02h7npw, military.casualties.military_conflict, World War II
World War II, common.topic.article, m.081q5
World War II, base.skosbase.vocabulary_equivalent_topic.narrower_concept, World War, 1939-1945--Hostages
World War II, time.event.locations, Asia
m.02h7np1, military.military_command.military_conflict, World War II
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Lt. Cmdr. Robby Jackson
m.09y4ljx, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09x773p
Ronald Reagan, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09wl5j0
m.09yj2jt, common.webpage.topic, World War II
m.02h7nns, military.military_command.military_conflict, World War II
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Town Destroyer
m.02h7nqf, military.casualties.military_conflict, World War II
World War II, base.jewlib.jewish_studies_field.collections, Captured German Records
President of the United States, common.topic.webpage, m.09xlnpm
World War II, common.topic.webpage, m.09y6kxc
m.09y8d_t, common.webpage.topic, World War II
m.09yybjl, common.webpage.topic, World War II
Living with the Dead: W. Eugene Smith and World War II, exhibitions.exhibition.subjects, World War II
m.09ydx3t, common.webpage.topic, World War II
World War II, common.topic.webpage, m.0b48dsf
World War II, common.topic.webpage, m.0b49cc7
President of the United States, common.topic.webpage, m.09ysj6g
m.02h7npb, military.military_command.military_conflict, World War II
President of the United States, common.topic.image, George Washington, first President of the United States
World War II, time.event.included_in_event, 20th century
m.09wsrnl, common.webpage.topic, World War II
Allies of World War II, common.topic.image, m.02923_6
World War II, common.topic.webpage, m.09wsxxn
Charles Lee, common.topic.image, George Washington, first President of the United States
World War II, time.event.locations, Europe
m.09yfzdj, common.webpage.topic, World War II
World War II, common.topic.webpage, m.09yggz2
George Washington, first President of the United States, common.image.appears_in_topic_gallery, President of the United States
World War II, tv.tv_subject.tv_programs, Band of Brothers
World War II, military.military_conflict.commanders, m.02h7nn7
Dying Soldier, visual_art.artwork.art_subject, World War II
President of the United States, common.topic.webpage, m.09w6h41
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rm8xf
President of the United States, freebase.type_profile.equivalent_topic, US President
m.03q2h_9, government.government_position_held.office_holder, Franklin D. Roosevelt
m.02h7npm, military.casualties.military_conflict, World War II
World War II, military.military_conflict.commanders, m.02h7nmz
President of the United States, common.topic.webpage, m.0hnjbwk
World War II, common.topic.webpage, m.09y8d_t
m.09x4cx1, common.webpage.topic, World War II
World War II, time.event.included_in_event, 1940s
World War II, military.military_conflict.commanders, m.0w5t9rt
President of the United States, common.topic.webpage, m.09xgz2n
World War II, time.event.locations, Southeast Asia
World War II, base.morelaw.war.peace_treaty, Treaty of Vis
m.04jx14r, military.military_command.military_conflict, World War II
m.09xq5z0, common.webpage.topic, World War II
m.043wpsh, military.casualties.combatant, United States of America
World War II, base.jewlib.jewish_studies_field.collections, Mauthausen Death Books
Allies of World War II, military.military_combatant.includes_allies, Soviet Union
President of the United States, common.topic.webpage, m.09ynr7x
The War Illustrated, book.periodical.subjects, World War II
President of the United States, common.topic.notable_for, g.125734vfj
President of the United States, base.schemastaging.context_name.pronunciation, g.125_lw0zw
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Adolf Hitler
World War II, base.jewlib.jewish_studies_field.collections, Footnote.com - Holocaust Collection
World War II, event.speech_topic.speeches_or_presentations_on_this_topic, m.05rnk1w

Answer: Franklin D. Roosevelt