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 university attended by Barack Obama was the site of the 2014 Pulitzer Prize? 
Knowledge Triplets: 2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108bn0w
m.01085w94, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010838xf
m.010869c8, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.01086sfh
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108762y
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.01084vq4
Pulitzer Prize for Feature Writing, award.award_category.winners, m.0108yrx7
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108798m
m.010875qk, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108flb5, award.award_honor.award, Pulitzer Prize for History
Louisa Gross Horwitz Prize, award.award_category.presenting_organization, Columbia University
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01085r2x
m.0108d7l3, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108fmwq
Pulitzer Prize for Feature Photography, award.award_category.winners, m.0108cq5x
2013 Pulitzer Prize, common.topic.notable_types, Award ceremony
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gg_v
Barack Obama, award.award_winner.awards_won, m.0z3z8vt
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108g526
m.0nbyhy_, education.education.student, Barack Obama
m.012m4x3m, education.education.student, Barack Obama
m.0wjhdt8, award.award_nomination.award_nominee, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108dwrq
m.0_sqn39, award.award_nomination.award_nominee, Barack Obama
m.02nqgn2, education.education.student, Barack Obama
m.0108r1sw, award.award_honor.award, Pulitzer Prize for Public Service
m.010864fq, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01083fmh
m.01086sfh, award.award_honor.ceremony, 2014 Pulitzer Prize
m.0108gpyw, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108fmwq, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01086cl4, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.02nqgmw, education.education.student, Barack Obama
Barack Obama Academy, education.educational_institution.school_type, State school
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108qsby
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108g7dk
Barack Obama, award.award_nominee.award_nominations, m.0sglb0x
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108cwt1
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108zd1w
m.01084vq4, award.award_honor.award, Pulitzer Prize for National Reporting
Barack Obama, award.award_winner.awards_won, m.07wkhf7
Barack Obama, award.award_nominee.award_nominations, m.0z1zxqx
Pulitzer Prize for Breaking News Reporting, award.award_category.nominees, m.010838xf
m.0108hjw4, award.award_honor.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Breaking News Reporting, award.award_category.nominees, m.010839_s
Barack Obama, award.award_nominee.award_nominations, m.0k0xg8d
m.0108bpd6, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Commentary, award.award_category.winners, m.010869c8
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108cz9w
m.0108d8qh, award.award_nomination.ceremony, 2014 Pulitzer Prize
Barack Obama Academy, common.topic.notable_for, g.125cqrqr7
Barack Obama, award.award_nominee.award_nominations, m.0kfngwx
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01085nry
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.01085h86
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gy17
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108g4sw
Barack Obama, award.award_winner.awards_won, m.0zt6x0d
m.0108lt4r, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0sglb0x, award.award_nomination.award_nominee, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108747r
m.0108dtpw, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, time.event.locations, Columbia University
m.07q4d74, award.award_honor.award_winner, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108hjw4
m.01083lbp, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01082x0h
m.0108qsby, award.award_honor.ceremony, 2014 Pulitzer Prize
Barack Obama, award.award_winner.awards_won, m.0p7ly8b
2014 Pulitzer Prize, common.topic.notable_for, g.11b5lvcv8y
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108yrx7
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108gl4y
Pulitzer Prize for Music, award.award_category.nominees, m.0108lt4r
m.07wkhf7, award.award_honor.award_winner, Barack Obama
Barack Obama Academy, common.topic.notable_types, School
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010873zh
Barack Obama, award.award_winner.awards_won, m.02nr844
m.01086v51, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086w4t
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010864fq
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108dsyf
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108c6dp
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108g3bd
m.012m9zwm, education.education.student, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01084__5
m.01086ygs, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108fqnx, award.award_nomination.award, Pulitzer Prize for History
Pulitzer Prize for Drama, award.award_category.nominees, m.0108dz5k
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010839_s
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108lt4r
m.0108525m, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01085r2x, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108c6dp, award.award_honor.ceremony, 2014 Pulitzer Prize
m.01082tmt, award.award_nomination.award, Pulitzer Prize for Public Service
Barack Obama, award.award_winner.awards_won, m.07q4d74
Barack Obama Academy, education.educational_institution.school_type, Public school
m.01082vy5, award.award_nomination.ceremony, 2014 Pulitzer Prize
Columbia University, location.location.events, 2013 Pulitzer Prize
m.0108g7dk, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0p7ly8b, award.award_honor.award_winner, Barack Obama
m.0108cwt1, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.010861xt, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108dbr5
m.0108bn0w, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.02nqgmw, education.education.institution, Columbia University
m.0_sty2m, award.award_honor.award_winner, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086g73
m.0108fppr, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108d66h, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108gsbh
m.0108gy17, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Local Reporting, award.award_category.nominees, m.01084qsw
Pulitzer Prize for Drama, award.award_category.nominees, m.0108dtpw
m.0kfngwx, award.award_nomination.award_nominee, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01083lbp
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086v51
Pulitzer Prize for Local Reporting, award.award_category.winners, m.0108qsby
m.0108r1sw, award.award_honor.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Fiction, award.award_category.winners, m.0108d66h
m.0108flb5, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108652y
2013 Pulitzer Prize, time.event.locations, Columbia University
m.0108dz5k, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108bpd6
m.01085nry, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108csv4, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108372m
Pulitzer Prize for Editorial Cartooning, award.award_category.winners, m.0108c6dp
m.0108g39y, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Breaking News Reporting, award.award_category.nominees, m.0108372m
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01084qsw
Pulitzer Prize for Music, award.award_category.winners, m.0108m8ms
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108dz5k
Columbia University, location.location.events, 2012 Pulitzer Prize
2012 Pulitzer Prize, time.event.locations, Columbia University
Barack Obama Academy, education.school.school_district, Oakland Unified School District
Barack Obama, award.award_winner.awards_won, m.0_sty2m
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01082vy5
Pulitzer Prize for International Reporting, award.award_category.winners, m.01085h86
m.02nr844, award.award_honor.award_winner, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108d8qh
Barack Obama Academy, common.topic.article, m.05q8vwp
Pulitzer Prize for Drama, award.award_category.winners, m.0108dsyf
m.0108hxr7, award.award_honor.ceremony, 2014 Pulitzer Prize
m.0108fppr, award.award_nomination.award, Pulitzer Prize for History
m.012l94sv, education.education.student, Barack Obama
m.01085w94, award.award_nomination.award, Pulitzer Prize for International Reporting
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01085pk7
m.01082vy5, award.award_nomination.award, Pulitzer Prize for Public Service
m.010838xf, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108hxhy, award.award_honor.ceremony, 2014 Pulitzer Prize
Barack Obama Academy, location.location.geolocation, m.012270h6
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108hxhy
m.010873zh, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for National Reporting, award.award_category.winners, m.01084vq4
Barack Obama, award.award_nominee.award_nominations, m.0_sqn39
Pulitzer Prize for Public Service, award.award_category.winners, m.0108g8xn
m.012m11bj, education.education.student, Barack Obama
2012 Pulitzer Prize, time.event.instance_of_recurring_event, Pulitzer Prize Ceremony
Barack Obama, award.award_nominee.award_nominations, m.0z3z8w_
Columbia University, award.award_presenting_organization.awards_presented, Louisa Gross Horwitz Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108gp97
m.0108798m, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0nbyhqc, education.education.student, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086gyk
m.01084__5, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01085pk7, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01084wxh, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108gpcg, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Local Reporting, award.award_category.nominees, m.0108652y
m.0108g6vj, award.award_nomination.ceremony, 2014 Pulitzer Prize
College/University, common.topic.notable_types, Columbia University
m.0108747r, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Criticism, award.award_category.winners, m.01086sfh
Pulitzer Prize for Explanatory Reporting, award.award_category.nominees, m.0108zd1w
m.01085pk7, award.award_nomination.award, Pulitzer Prize for International Reporting
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108d7l3
m.0k0xg8d, award.award_nomination.award_nominee, Barack Obama
Pulitzer Prize for Explanatory Reporting, award.award_category.nominees, m.01084kql
Louisa Gross Horwitz Prize, award.award.presented_by, Columbia University
m.0xn8125, education.honorary_degree.recipient, Barack Obama
Pulitzer Prize for Local Reporting, award.award_category.nominees, m.01085664
Pulitzer Prize for Drama, award.award_category.nominees, m.0108dwrq
m.0108372m, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0nbyj44, education.education.student, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gpyw
Barack Obama, award.award_nominee.award_nominations, m.0wjhdt8
2014 Pulitzer Prize, time.event.instance_of_recurring_event, Pulitzer Prize Ceremony
m.0_sqn04, award.award_honor.award_winner, Barack Obama
m.0108g3bd, award.award_honor.ceremony, 2014 Pulitzer Prize
m.0108g8xn, award.award_honor.ceremony, 2014 Pulitzer Prize
m.01084kql, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01083srt
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01084kql
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01084wxh
Pulitzer Prize for Music, award.award_category.nominees, m.0108gdrh
m.0108gl4y, award.award_honor.ceremony, 2014 Pulitzer Prize
m.01082x0h, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01085h86, award.award_honor.award, Pulitzer Prize for International Reporting
Pulitzer Prize for Poetry, award.award_category.winners, m.0108g3bd
Columbia University, location.location.events, 2014 Pulitzer Prize
Pulitzer Prize for Explanatory Reporting, award.award_category.winners, m.0108gsbh
Pulitzer Prize for General Non-Fiction, award.award_category.winners, m.0108hxr7
m.01086gyk, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01085664
m.01085664, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108g8xn, award.award_honor.award, Pulitzer Prize for Public Service
Pulitzer Prize for Editorial Writing, award.award_category.winners, m.0108hxhy
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.010869c8
m.0108gp97, award.award_honor.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Investigative Reporting, award.award_category.winners, m.0108gp97
m.0108dwrq, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, common.topic.notable_types, Award ceremony
m.0108gdrh, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108fqnx, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01086g73, award.award_nomination.ceremony, 2014 Pulitzer Prize
Pulitzer Prize for Music, award.award_category.nominees, m.0108h7wk
Barack Obama, award.award_winner.awards_won, m.0_sqn04
m.0108gsbh, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108g39y
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01084c9q
m.0108dbr5, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108flb5
Bancroft Prize, award.award.presented_by, Columbia University
m.0108zd1w, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01086310, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108652y, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010875qk
m.0z3z8vt, award.award_honor.award_winner, Barack Obama
Barack Obama, people.person.education, m.0nbyhqc
2014 Pulitzer Prize, location.location.events, Columbia University
m.01084qsw, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108dtpw
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108g6vj
m.0108cq5x, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108d66h
m.0108762y, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01084vq4, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108fqnx
m.0z3z8w_, award.award_nomination.award_nominee, Barack Obama
Pulitzer Prize for Breaking News Reporting, award.award_category.winners, m.0108gl4y
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086ygs
m.0108gg_v, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01082x0h, award.award_nomination.award, Pulitzer Prize for Public Service
Pulitzer Prize for Public Service, award.award_category.winners, m.0108r1sw
m.0108gqf6, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.010839_s, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0108m8ms, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108br0g
m.02nqgpk, education.education.student, Barack Obama
m.0108yrx7, award.award_honor.ceremony, 2014 Pulitzer Prize
m.01085h86, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01082tmt
2014 Pulitzer Prize, award.award_ceremony.nominees, m.010861xt
m.0108dsyf, award.award_honor.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01085w94
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108fppr
2012 Pulitzer Prize, common.topic.notable_types, Award ceremony
m.0108g526, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.01084wxh, award.award_nomination.award, Pulitzer Prize for National Reporting
Pulitzer Prize Ceremony, time.recurring_event.instances, 2012 Pulitzer Prize
m.01083srt, award.award_nomination.ceremony, 2014 Pulitzer Prize
2013 Pulitzer Prize, time.event.instance_of_recurring_event, Pulitzer Prize Ceremony
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108r1sw
m.01084c9q, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gpcg
m.02nqgp6, education.education.student, Barack Obama
Pulitzer Prize for Explanatory Reporting, award.award_category.nominees, m.01084c9q
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gqf6
Pulitzer Prize Ceremony, time.recurring_event.instances, 2013 Pulitzer Prize
Pulitzer Prize for History, award.award_category.winners, m.0108flb5
m.01086w4t, award.award_nomination.ceremony, 2014 Pulitzer Prize
Barack Obama, education.honorary_degree_recipient.honorary_degrees, m.0xn8125
Barack Obama, people.person.education, m.02nqgmw
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108csv4
m.0108cz9w, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.0zt6x0d, award.award_honor.award_winner, Barack Obama
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108gdrh
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108m8ms
m.01082tmt, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086310
m.0108h7wk, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108g8xn
2014 Pulitzer Prize, award.award_ceremony.nominees, m.01086cl4
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108525m
m.0108525m, award.award_nomination.award, Pulitzer Prize for National Reporting
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108cq5x
2014 Pulitzer Prize, award.award_ceremony.nominees, m.0108h7wk
Pulitzer Prize for Biography or Autobiography, award.award_category.winners, m.0108g4sw
m.0108br0g, award.award_nomination.ceremony, 2014 Pulitzer Prize
m.012m6w18, education.education.student, Barack Obama
Pulitzer Prize Ceremony, time.recurring_event.instances, 2014 Pulitzer Prize
m.01083fmh, award.award_nomination.ceremony, 2014 Pulitzer Prize
2014 Pulitzer Prize, award.award_ceremony.awards_presented, m.0108hxr7
2014 Pulitzer Prize, freebase.valuenotation.is_reviewed, Start date
m.0108g4sw, award.award_honor.ceremony, 2014 Pulitzer Prize

Answer: Columbia University