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 President of the United States during WWII ended his governmental position prior to 18 January 1940? 
Knowledge Triplets: President of the United States, government.government_office_or_title.office_holders, m.04469xv
United States of America, military.military_combatant.belongs_to_combatant_group, Allies of World War II
President of the United States, government.government_office_or_title.office_holders, m.03fx83k
John F. Kennedy, common.topic.notable_types, US President
m.04469y1, government.government_position_held.office_holder, James Buchanan
President of the United States, book.book_subject.works, White House Ghosts: Presidents and Their Speechwriters
May 10-1940 Germany Invades Holland!, common.topic.subjects, World War II
m.04s_2dh, government.government_position_held.office_position_or_title, President of the United States
Lyndon B. Johnson, government.us_vice_president.to_president, John F. Kennedy
m.05rln07, event.speech_or_presentation.speaker_s, Franklin D. Roosevelt
President of the United States, book.book_subject.works, The Sound of Leadership: Presidential Communication in the Modern Age
m.02k6vpl, government.government_position_held.office_position_or_title, President of the United States
Theodore Roosevelt, government.us_vice_president.to_president, William McKinley
President of the United States, book.book_subject.works, First Off the Tee: Presidential Hackers, Duffers, and Cheaters From Taft to Bush
m.02kzpyv, government.government_position_held.office_position_or_title, President of the United States
Andrew Jackson, government.us_president.vice_president, Martin Van Buren
m.03fx88m, government.government_position_held.office_holder, Ulysses S. Grant
President of the United States, book.book_subject.works, Madam President
President of the United States, government.government_office_or_title.office_holders, m.04469xf
President of the United States, government.government_office_or_title.office_holders, m.04469y1
President of the United States, common.topic.webpage, m.0hnjbwk
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Town Destroyer
World War II, common.topic.webpage, m.09xxnlt
John F. Kennedy, government.politician.government_positions_held, m.02hz5r6
World War II, common.topic.webpage, m.09yj2jt
President of the United States, common.topic.webpage, m.04lsvx0
World War II, common.topic.webpage, m.09xrmvz
President of the United States, government.government_office_or_title.office_holders, m.03fx817
m.02h6phn, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.09xm31x
President of the United States, government.government_office_or_title.jurisdiction, United States of America
President of the United States, government.government_office_or_title.office_holders, m.02k6vpl
Dwight D. Eisenhower, people.person.nationality, United States of America
US President, type.type.domain, Government
World War II, common.topic.webpage, m.0b49czw
World War II, common.topic.webpage, m.09w7qyh
Jimmy Carter, government.politician.government_positions_held, m.0446b70
m.09xm31x, common.webpage.topic, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx82m
World War II, common.topic.webpage, m.09x5b2d
World War II, common.topic.webpage, m.09y9l5w
World War II, common.topic.subject_of, May 10-1940 Germany Invades Holland!
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War II
m.0446b8l, government.government_position_held.office_holder, Dwight D. Eisenhower
George Washington, first President of the United States, common.image.appears_in_topic_gallery, George Washington
m.0hnjbwk, common.webpage.topic, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.0446b8l
m.03fx817, government.government_position_held.office_position_or_title, President of the United States
President of the United States, book.book_subject.works, Max for President
United States of America, government.governmental_jurisdiction.government_positions, Vice President of the United States
Warren G. Harding, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.jurisdiction, United States of America
World War II, common.topic.webpage, m.0b46rff
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Conrad Dalton
World War II, common.topic.webpage, m.09xq5z0
m.03fx82m, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx88m
World War II, common.topic.webpage, m.0b46p4g
President of the United States, government.government_office_or_title.office_holders, m.03fx7zy
Franklin D. Roosevelt, government.us_president.vice_president, Harry S. Truman
President of the United States, common.topic.webpage, m.0b464_j
World War II, common.topic.webpage, m.09yybjl
World War II, common.topic.webpage, m.0b48g2t
World War II, common.topic.webpage, m.09ydx3t
President of the United States, common.topic.webpage, m.09ygxjq
Lyndon B. Johnson, military.military_person.participated_in_conflicts, World War II
Grover Cleveland, common.topic.notable_types, US President
President of the United States, base.schemastaging.context_name.pronunciation, g.125_lw0zw
President of the United States, government.government_office_or_title.office_holders, m.0446b9j
World War II, common.topic.webpage, m.09w7nt9
John F. Kennedy, government.us_president.vice_president, Lyndon B. Johnson
George Washington, first President of the United States, common.image.size, m.02f0j1t
President of the United States, book.book_subject.works, The Moral Rhetoric of American Presidents
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Ulysses S. Grant
m.0446bcc, government.government_position_held.office_position_or_title, President of the United States
m.0b464_j, common.webpage.topic, President of the United States
m.03fx8bt, government.government_position_held.office_position_or_title, President of the United States
John F. Kennedy, military.military_person.participated_in_conflicts, World War II
World War II, common.topic.webpage, m.09wl5j0
World War II, common.topic.webpage, m.09wwp1v
President of the United States, base.firsts.achievement.firsts, m.04wrwjv
m.03fx88b, government.government_position_held.office_holder, Warren G. Harding
Lyndon B. Johnson, government.politician.government_positions_held, m.03fx81_
m.05ckhcc, common.webpage.topic, President of the United States
President of the United States, book.book_subject.works, Grace for President
James K. Polk, common.topic.notable_types, US President
United States of America, government.governmental_jurisdiction.government_positions, President of the United States
President of the United States, common.topic.notable_for, g.125734vfj
Władysław Sikorski, military.military_person.participated_in_conflicts, World War II
m.04469y8, government.government_position_held.office_position_or_title, President of the United States
President of the United States, base.ontologies.ontology_class.equivalent_classes, m.0dj2gvv
World War II, common.topic.webpage, m.09xr1l4
President of the United States, government.government_office_or_title.office_holders, m.040b_7k
Richard Nixon, government.us_president.vice_president, Gerald Ford
George Washington, first President of the United States, common.image.appears_in_topic_gallery, The Imperial Presidency
President of the United States, common.topic.webpage, m.09w6h41
Warren G. Harding, government.us_president.vice_president, Calvin Coolidge
m.01xrx8q, government.government_position_held.office_position_or_title, President of the United States
World War II, common.topic.webpage, m.09y5hqr
m.03q2h_9, government.government_position_held.office_holder, Franklin D. Roosevelt
Vice President of the United States, government.government_office_or_title.jurisdiction, United States of America
George Washington, common.topic.notable_types, US President
US President, common.topic.article, m.03yy9v6
President of the United States, government.government_office_or_title.office_holders, m.02h6phn
Bill Clinton, common.topic.notable_types, US President
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Lt. Cmdr. Robby Jackson
Harry S. Truman, government.us_vice_president.to_president, Franklin D. Roosevelt
John Adams, common.topic.notable_types, US President
President Thomas Westwood, fictional_universe.fictional_character.occupation, President of the United States
President of the United States, base.firsts.achievement.firsts, m.04wrx4g
John Adams, government.us_president.vice_president, Thomas Jefferson
Gerald Ford, government.us_vice_president.to_president, Richard Nixon
Dwight D. Eisenhower, government.politician.government_positions_held, m.0446b8l
President of the United States, government.government_office_or_title.office_holders, m.03fx7_v
William Howard Taft, government.politician.government_positions_held, m.03fx83k
World War II, common.topic.webpage, m.09yggz2
President of the United States, freebase.type_profile.equivalent_topic, US President
President of the United States, book.book_subject.works, Burn Before Reading: Presidents, CIA Directors, and Secret Intelligence
Theodore Roosevelt, common.topic.notable_types, US President
George H. W. Bush, military.military_person.participated_in_conflicts, World War II
m.03fx83k, government.government_position_held.office_position_or_title, President of the United States
Woodrow Wilson, common.topic.notable_types, US President
President of the United States, common.topic.webpage, m.09y93hy
World War I, base.culturalevent.event.entity_involved, Woodrow Wilson
World War II, event.speech_or_presentation.speech_topic, m.05rln07
m.02hz5r6, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx7j8
m.0446bdb, government.government_position_held.office_holder, Abraham Lincoln
John Tyler, government.us_vice_president.to_president, William Henry Harrison
World War II, common.topic.webpage, m.09wxv0j
m.0446bdb, government.government_position_held.office_position_or_title, President of the United States
m.03fx7_v, government.government_position_held.office_position_or_title, President of the United States
President of the United States, book.book_subject.works, Otto Runs for President
m.02kzpyv, government.government_position_held.office_holder, Ronald Reagan
Abraham Lincoln, government.us_president.vice_president, Andrew Johnson
President of the United States, common.topic.image, George Washington, first President of the United States
m.03fx838, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.category, President
President of the United States, book.book_subject.works, The Rhetorical Presidency
George W. Bush, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.04466xb
John Quincy Adams, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.04466xz
President of the United States, government.government_office_or_title.office_holders, m.02s9flj
m.09y9g34, common.webpage.topic, President of the United States
George S. Patton, military.military_person.participated_in_conflicts, World War II
President of the United States, government.government_office_or_title.office_holders, m.04466xm
m.0446b9j, government.government_position_held.office_holder, Herbert Hoover
World War II, common.topic.webpage, m.09yjnz5
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.03fx85y, government.government_position_held.office_position_or_title, President of the United States
m.0663zsk, common.webpage.topic, President of the United States
Ronald Reagan, common.topic.notable_types, US President
US President, freebase.type_profile.equivalent_topic, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx899
Richard Nixon, common.topic.notable_types, US President
George H. W. Bush, government.us_vice_president.to_president, Ronald Reagan
President of the United States, base.firsts.achievement.firsts, m.04xdfjz
m.09w6h41, common.webpage.topic, President of the United States
President of the United States, common.topic.webpage, m.05ckhcc
Ronald Reagan, military.military_person.participated_in_conflicts, World War II
President of the United States, government.government_office_or_title.office_holders, m.03fx7hy
World War II, common.topic.webpage, m.09y2gbs
Richard Nixon, government.politician.government_positions_held, m.03fx8cf
m.03fx817, government.government_position_held.office_holder, Harry S. Truman
President of the United States, people.appointed_role.appointment, m.0c1svhh
President of the United States, base.schemastaging.context_name.plural, m.0w0qt9b
World War II, common.topic.webpage, m.09y8d_t
Stephen King on J.D. Salinger: 'The last of the great post-WWII American writers', common.resource.annotations, m.09yvl19
m.04466xm, government.government_position_held.office_position_or_title, President of the United States
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Abraham Lincoln
John Adams, government.us_vice_president.to_president, George Washington
m.04469y1, government.government_position_held.office_position_or_title, President of the United States
Andrew Johnson, government.us_vice_president.to_president, Abraham Lincoln
World War II, common.topic.webpage, m.09ygg0r
World War II, common.topic.webpage, m.09yfzdj
Herbert Hoover, government.politician.government_positions_held, m.0446b9j
Harry S. Truman, government.politician.government_positions_held, m.03fx817
Dwight D. Eisenhower, government.us_president.vice_president, Richard Nixon
Franklin D. Roosevelt, common.topic.notable_types, US President
Zachary Taylor, government.us_president.vice_president, Millard Fillmore
Andrew Johnson, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.04469y8
World War II, common.topic.webpage, m.09w41xr
President of the United States, government.government_office_or_title.office_holders, m.03fx838
Herbert Hoover, common.topic.notable_types, US President
World War II, common.topic.webpage, m.0b49cc7
President of the United States, common.topic.webpage, m.0663zsk
Richard Nixon, government.us_vice_president.to_president, Dwight D. Eisenhower
President of the United States, common.topic.webpage, m.09ynr7x
President of the United States, government.government_office_or_title.office_holders, m.04s_2dh
m.01xrx8q, government.government_position_held.office_holder, George H. W. Bush
President of the United States, base.firsts.achievement.firsts, m.08ntjg4
President of the United States, common.topic.notable_types, Government Office or Title
m.03fx7hy, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx85y
George Washington, common.topic.image, George Washington, first President of the United States
President of the United States, common.topic.webpage, m.09w6pyk
m.03fx899, government.government_position_held.office_holder, Theodore Roosevelt
President of the United States, common.topic.webpage, m.09xlnpm
m.09xgz2n, common.webpage.topic, President of the United States
m.04469xf, government.government_position_held.office_position_or_title, President of the United States
Vice President of the United States, common.topic.notable_types, Government Office or Title
President of the United States, government.government_office_or_title.office_holders, m.0446b70
m.02h6phn, government.government_position_held.office_holder, George W. Bush
m.0b46f7h, common.webpage.topic, President of the United States
James A. Garfield, government.us_president.vice_president, Chester A. Arthur
President of the United States, government.government_office_or_title.office_holders, m.03fx81_
President of the United States, common.topic.webpage, m.09xgz2n
World War II, common.topic.webpage, m.09wsxxn
World War II, common.topic.webpage, m.09yf8lh
Franklin D. Roosevelt, government.politician.government_positions_held, m.03q2h_9
William Henry Harrison, common.topic.notable_types, US President
President of the United States, book.book_subject.works, Presidential Leadership: Rating the Best and the Worst in the White House
William McKinley, government.us_president.vice_president, Theodore Roosevelt
World War II, common.topic.webpage, m.09y4ljx
Thomas Jefferson, government.us_vice_president.to_president, John Adams
Mediterranean and Middle East theatre of World War II, base.culturalevent.event.entity_involved, Dwight D. Eisenhower
President of the United States, common.topic.webpage, m.09y9g34
World War II, common.topic.webpage, m.09yvl19
m.03fx88b, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.webpage, m.09wvy_x
Theodore Roosevelt, government.politician.government_positions_held, m.03fx899
George W. Bush, government.politician.government_positions_held, m.02h6phn
President of the United States, business.employer.employees, m.0czp5hh
President of the United States, government.government_office_or_title.office_holders, m.0446bdk
President of the United States, government.government_office_or_title.office_holders, m.04466zr
Richard Nixon, military.military_person.participated_in_conflicts, World War II
m.04469xv, government.government_position_held.office_position_or_title, President of the United States
Benjamin Harrison, common.topic.notable_types, US President
m.09wvy_x, common.webpage.topic, President of the United States
President Pennybaker, book.written_work.subjects, President of the United States
m.09ysj6g, common.webpage.topic, President of the United States
President of the United States, freebase.equivalent_topic.equivalent_type, US President
Andrew Jackson, common.topic.notable_types, US President
m.0446b70, government.government_position_held.office_holder, Jimmy Carter
m.04lsvx0, common.webpage.topic, President of the United States
m.03q2h_9, government.government_position_held.office_position_or_title, President of the United States
Charles Lee, common.topic.image, George Washington, first President of the United States
World War II, common.topic.webpage, m.0b45zcq
President of the United States, government.government_office_or_title.office_holders, m.03fx83v
m.03fx81_, government.government_position_held.office_holder, Lyndon B. Johnson
Lyndon B. Johnson, common.topic.notable_types, US President
President of the United States, government.government_office_or_title.office_holders, m.04469yh
Jimmy Carter, common.topic.notable_types, US President
Martin Van Buren, government.us_vice_president.to_president, Andrew Jackson
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, Josiah Bartlet
Rutherford B. Hayes, common.topic.notable_types, US President
George H. W. Bush, government.politician.government_positions_held, m.01xrx8q
President of the United States, government.government_office_or_title.office_holders, m.02kzpyv
m.02s9flj, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.04466tx
President of the United States, book.book_subject.works, President Pennybaker
Benito Mussolini, military.military_person.participated_in_conflicts, World War II
President of the United States, common.topic.webpage, m.09ysj6g
President of the United States, government.government_office_or_title.office_holders, m.03fx88b
World War II, time.event.included_in_event, 1940s
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Presidency of George Washington
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
President of the United States, fictional_universe.character_occupation.characters_with_this_occupation, President Thomas Westwood
President of the United States, book.book_subject.works, The Reader's Companion to the American Presidency
President of the United States, government.government_office_or_title.office_holders, m.0446bdb
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, World War I
m.09y93hy, common.webpage.topic, President of the United States
m.04466xz, government.government_position_held.office_position_or_title, President of the United States
United States of America, people.person.nationality, Franklin D. Roosevelt
m.09ynr7x, common.webpage.topic, President of the United States
m.03fx83v, government.government_position_held.office_position_or_title, President of the United States
Harry S. Truman, common.topic.notable_types, US President
World War II, common.topic.webpage, m.09y6kxc
1940s, common.topic.image, World War II montage image
World War II, common.topic.webpage, m.09x773p
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
President of the United States, government.government_office_or_title.office_holders, m.03q2h_9
President of the United States, government.government_office_or_title.office_holders, m.0446b9r
m.09w6pyk, common.webpage.topic, President of the United States
Dwight D. Eisenhower, common.topic.notable_types, US President
World War II, common.topic.article, m.081q5
World War II, common.topic.webpage, m.09wgp4k
m.03fx7hy, government.government_position_held.office_holder, Grover Cleveland
James Buchanan, common.topic.notable_types, US President
Ronald Reagan, government.us_president.vice_president, George H. W. Bush
George H. W. Bush, common.topic.notable_types, US President
James Monroe, common.topic.notable_types, US President
James A. Garfield, common.topic.notable_types, US President
President of the United States, business.employer.employees, m.0whvvj4
m.04469yh, government.government_position_held.office_position_or_title, President of the United States
Ulysses S. Grant, common.topic.notable_types, US President
James Madison, common.topic.notable_types, US President
World War II, common.topic.webpage, m.09xwgl8
World War II, common.topic.webpage, m.09wwvtm
m.0446bdk, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.02hz5r6
m.03fx7j8, government.government_position_held.office_position_or_title, President of the United States
m.09xlnpm, common.webpage.topic, President of the United States
Dwight D. Eisenhower, military.military_person.participated_in_conflicts, Vietnam War
President of the United States, common.topic.article, m.060dd
m.03fx83k, government.government_position_held.office_holder, William Howard Taft
m.0446b8l, government.government_position_held.office_position_or_title, President of the United States
m.0446b9r, government.government_position_held.office_position_or_title, President of the United States
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Charles Lee
m.03fx81_, government.government_position_held.office_position_or_title, President of the United States
Vice President of the United States, freebase.valuenotation.has_no_value, Governmental body (if any)
George Washington, government.us_president.vice_president, John Adams
President of the United States, base.ontologies.ontology_instance.equivalent_instances, m.07nflbk
President of the United States, government.government_office_or_title.office_holders, m.03fx8bt
World War II, common.topic.webpage, m.0b6rtrx
World War II, common.topic.webpage, m.09xyz9p
m.04466xb, government.government_position_held.office_position_or_title, President of the United States
m.03q2h_9, government.government_position_held.office_holder, Franklin D. Roosevelt
Harry S. Truman, military.military_person.participated_in_conflicts, World War I
William Howard Taft, common.topic.notable_types, US President
m.03fx838, government.government_position_held.office_holder, Woodrow Wilson
m.04466tx, government.government_position_held.office_position_or_title, President of the United States
Chester A. Arthur, government.us_vice_president.to_president, James A. Garfield
World War II, common.topic.webpage, m.09xss79
President of the United States, government.government_office_or_title.office_holders, m.03q2h_9
William McKinley, common.topic.notable_types, US President
George Washington, first President of the United States, common.image.appears_in_topic_gallery, President of the United States
m.04466zr, government.government_position_held.office_position_or_title, President of the United States
m.03fx8cf, government.government_position_held.office_holder, Richard Nixon
World War II, common.topic.webpage, m.09y0608
President of the United States, government.government_office_or_title.office_holders, m.0446bcc
William Henry Harrison, government.us_president.vice_president, John Tyler
m.03fx8cf, government.government_position_held.office_position_or_title, President of the United States
World War II, common.topic.webpage, m.09wgp7j
World War II, common.topic.webpage, m.09x4cx1
World War II, common.topic.webpage, m.0b48dsf
Millard Fillmore, government.us_vice_president.to_president, Zachary Taylor
US President, common.topic.notable_types, Franklin D. Roosevelt
Calvin Coolidge, government.us_vice_president.to_president, Warren G. Harding
m.040b_7k, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx8cf
m.03fx7zy, government.government_position_held.office_position_or_title, President of the United States
President of the United States, common.topic.image, Official portrait of Barack Obama
World War II, common.topic.webpage, m.09wsrnl
m.03fx8c3, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx87q
George Washington, first President of the United States, common.image.appears_in_topic_gallery, Powers of the President of the United States
President of the United States, government.government_office_or_title.office_holders, m.03fx8c3
m.03fx899, government.government_position_held.office_position_or_title, President of the United States
m.02hz5r6, government.government_position_held.office_holder, John F. Kennedy
President of the United States, common.topic.webpage, m.0b46f7h
m.09ygxjq, common.webpage.topic, President of the United States
World War II, common.topic.webpage, m.09ybsfr
World War II, common.topic.webpage, m.09ysx61
m.0446b9j, government.government_position_held.office_position_or_title, President of the United States
m.03fx88m, government.government_position_held.office_position_or_title, President of the United States
m.0446b70, government.government_position_held.office_position_or_title, President of the United States
President of the United States, government.government_office_or_title.office_holders, m.01xrx8q
Gerald Ford, military.military_person.participated_in_conflicts, World War II
m.03fx87q, government.government_position_held.office_position_or_title, President of the United States
Woodrow Wilson, government.politician.government_positions_held, m.03fx838

Answer: Franklin D. Roosevelt