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: From what university did the Energy development speaker graduate from? 
Knowledge Triplets: Columbia University, education.educational_institution.students_graduates, m.02wnpgs
Energy development, business.industry.child_industry, Nuclear power debate
m.040sdd5, education.education.institution, Columbia University
m.02wnkym, education.education.institution, Columbia University
m.04q16my, education.education.institution, Columbia University
m.04hfpxj, education.education.institution, Columbia University
m.04hwlvq, education.education.institution, Columbia University
m.0bmypwr, education.education.institution, Columbia University
m.02wnsrm, education.education.institution, Columbia University
m.02wnmps, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Hydrogen economy
Columbia University, education.educational_institution.students_graduates, m.0_kwmww
m.02wnwtd, education.education.institution, Columbia University
m.04zddk5, education.education.institution, Columbia University
m.04hg174, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04lnbbb
m.07ltnvs, education.education.institution, Columbia University
m.0134pgpp, education.education.institution, Columbia University
m.04q19ss, education.education.institution, Columbia University
m.04lncrc, education.education.institution, Columbia University
m.04ystr2, education.education.institution, Columbia University
m.02wmqnx, education.education.institution, Columbia University
m.02wns24, education.education.institution, Columbia University
m.07skgzf, education.education.institution, Columbia University
m.02wnqrp, education.education.institution, Columbia University
m.0gmhhgw, education.education.institution, Columbia University
m.02wnssg, education.education.institution, Columbia University
m.06wgmm2, education.education.institution, Columbia University
m.02wpgdq, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.05yzdms
m.02wnsly, education.education.institution, Columbia University
m.07lhdcm, education.education.institution, Columbia University
m.05yzdsz, education.education.institution, Columbia University
m.09scccv, education.education.institution, Columbia University
m.04hfhnt, education.education.institution, Columbia University
m.0ggggyg, education.education.institution, Columbia University
m.06wgmbb, education.education.institution, Columbia University
m.02wnmkg, education.education.institution, Columbia University
m.06wghdv, education.education.institution, Columbia University
m.02wpfhc, education.education.institution, Columbia University
m.06wggqx, education.education.institution, Columbia University
Energy development, common.topic.notable_types, Industry
m.06wgnkd, education.education.institution, Columbia University
m.02wn85m, education.education.institution, Columbia University
m.0gvyccm, education.education.institution, Columbia University
m.09scc20, education.education.institution, Columbia University
m.0jzrmsq, education.education.institution, Columbia University
m.0gggktm, education.education.institution, Columbia University
m.02wns49, education.education.institution, Columbia University
m.04hg4zm, education.education.institution, Columbia University
m.02wn34f, education.education.institution, Columbia University
m.0sw3dlk, education.education.institution, Columbia University
m.02wpkht, education.education.institution, Columbia University
Energy development, common.topic.image, Shell Refueller
m.02wnnxp, education.education.institution, Columbia University
m.02wncz3, education.education.institution, Columbia University
m.04hrymn, education.education.institution, Columbia University
m.0sw37db, education.education.institution, Columbia University
m.02wmwck, education.education.institution, Columbia University
m.0svyrmw, education.education.institution, Columbia University
m.02wnrnk, education.education.institution, Columbia University
m.02wnstz, education.education.institution, Columbia University
m.05yzthb, education.education.institution, Columbia University
m.02wny0d, education.education.institution, Columbia University
m.02wpf49, education.education.institution, Columbia University
m.02wnfgq, education.education.institution, Columbia University
m.04ysvqq, education.education.institution, Columbia University
Energy development, common.topic.image, HDI & Electricity per capita
m.07ylhcq, education.education.institution, Columbia University
m.02wpcdf, education.education.institution, Columbia University
m.04hldfh, education.education.institution, Columbia University
m.02wns54, education.education.institution, Columbia University
m.040hpkt, education.education.institution, Columbia University
m.02wnnpy, education.education.institution, Columbia University
m.02wmrpf, education.education.institution, Columbia University
m.07sk705, education.education.institution, Columbia University
m.04ynvhj, education.education.institution, Columbia University
m.02wn8pt, education.education.institution, Columbia University
m.04dxhyk, education.education.institution, Columbia University
m.09vjktd, education.education.institution, Columbia University
Energy development, event.speech_topic.speeches_or_presentations_on_this_topic, m.0j31vdq
m.02wpg20, education.education.institution, Columbia University
m.02wprrp, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.07skgzf
m.04htnrg, education.education.institution, Columbia University
m.02wnndk, education.education.institution, Columbia University
m.0svsndt, education.education.institution, Columbia University
m.07ltrbf, education.education.institution, Columbia University
m.0w5dbrm, education.education.institution, Columbia University
m.04lnrjr, education.education.institution, Columbia University
m.04mbkkd, education.education.institution, Columbia University
m.04lnlbh, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04hrfcs
m.05yzhxm, education.education.institution, Columbia University
m.0gmhhvl, education.education.institution, Columbia University
m.04hgk2q, education.education.institution, Columbia University
m.02wn28z, education.education.institution, Columbia University
m.02wn4nx, education.education.institution, Columbia University
m.02wnch6, education.education.institution, Columbia University
m.02wmsqq, education.education.institution, Columbia University
m.0646m28, education.education.institution, Columbia University
m.0gmhfpw, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04hgkws
Energy development, business.industry.child_industry, Harvesting lightning energy
m.07sk7fs, education.education.institution, Columbia University
m.0hgtdjn, education.education.institution, Columbia University
m.0mzmgbl, education.education.institution, Columbia University
m.04hghcq, education.education.institution, Columbia University
m.04ysv28, education.education.institution, Columbia University
m.04chqcp, education.education.institution, Columbia University
m.02wptct, education.education.institution, Columbia University
m.02wmt49, education.education.institution, Columbia University
m.0ggghmd, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbgq2
m.02wnldt, education.education.institution, Columbia University
m.06wgh66, education.education.institution, Columbia University
m.02wprbr, education.education.institution, Columbia University
m.02wnsnt, education.education.institution, Columbia University
m.07sklh0, education.education.institution, Columbia University
m.07llr85, education.education.institution, Columbia University
m.05t85wk, education.education.institution, Columbia University
m.09sd24y, education.education.institution, Columbia University
m.07sk85d, education.education.institution, Columbia University
m.0wshlsd, education.education.institution, Columbia University
m.05yykg2, education.education.institution, Columbia University
m.04hry17, education.education.institution, Columbia University
m.04kfsgr, education.education.institution, Columbia University
m.04hrmt5, education.education.institution, Columbia University
Energy development, event.speech_topic.speeches_or_presentations_on_this_topic, m.0j31vdq
Energy development, base.schemastaging.context_name.pronunciation, m.013154yd
m.04hqqcm, education.education.institution, Columbia University
m.07ltwvm, education.education.institution, Columbia University
m.04lrfzl, education.education.institution, Columbia University
m.04lnybv, education.education.institution, Columbia University
m.02wn0yk, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04lnlzb
m.02whhyd, education.education.institution, Columbia University
m.02wpfqh, education.education.institution, Columbia University
m.02wnhn5, education.education.institution, Columbia University
m.09vmtgq, education.education.institution, Columbia University
m.0gtzdvf, education.education.institution, Columbia University
m.04dnxdg, education.education.institution, Columbia University
m.0hgtdkq, education.education.institution, Columbia University
m.04mgpmm, education.education.institution, Columbia University
m.02wnktd, education.education.institution, Columbia University
m.02wmzhp, education.education.institution, Columbia University
m.0cpfzhg, education.education.institution, Columbia University
m.04yt0br, education.education.institution, Columbia University
m.02wng19, education.education.institution, Columbia University
m.04lnbbb, education.education.institution, Columbia University
m.05yzdms, education.education.institution, Columbia University
m.02wpfhk, education.education.institution, Columbia University
m.02wnzdn, education.education.institution, Columbia University
Bachelor of Arts, education.education.degree, m.02wn48x
Barack Obama, people.person.education, m.02nqgmw
m.03gknvh, education.education.institution, Columbia University
m.04fmlm6, education.education.institution, Columbia University
m.02wmyjg, education.education.institution, Columbia University
m.02wngkq, education.education.institution, Columbia University
m.05yykqz, education.education.institution, Columbia University
m.0cpldhq, education.education.institution, Columbia University
m.02wnnqh, education.education.institution, Columbia University
m.02wndp6, education.education.institution, Columbia University
m.0fpkycb, education.education.institution, Columbia University
m.02wnpgs, education.education.institution, Columbia University
m.05yyht2, education.education.institution, Columbia University
m.0n0smdf, education.education.institution, Columbia University
m.02nqgmw, education.educational_institution.students_graduates, Columbia University
m.0j31vdq, event.speech_or_presentation.speech_topic, Energy development
m.05yyx85, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Distributed generation
m.04hmf3h, education.education.institution, Columbia University
m.05yzdgd, education.education.institution, Columbia University
m.06wggdr, education.education.institution, Columbia University
m.02wpcgd, education.education.institution, Columbia University
m.0hgtgmr, education.education.institution, Columbia University
m.04hg321, education.education.institution, Columbia University
m.04fmlmf, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbgn2
m.0dlqdmh, education.education.institution, Columbia University
m.0hgvycj, education.education.institution, Columbia University
m.04fs9sw, education.education.institution, Columbia University
m.04gckdw, education.education.institution, Columbia University
m.02wnnnm, education.education.institution, Columbia University
m.02wplds, education.education.institution, Columbia University
m.04mdln4, education.education.institution, Columbia University
m.04lnlzb, education.education.institution, Columbia University
m.0cpldfg, education.education.institution, Columbia University
Energy development, business.industry.companies, Lviv Insulator Company
Columbia University, education.educational_institution.students_graduates, m.04mbkkd
m.02wnm9h, education.education.institution, Columbia University
m.04htmbx, education.education.institution, Columbia University
m.04lnwqh, education.education.institution, Columbia University
m.02wptqh, education.education.institution, Columbia University
m.0gmhhdf, education.education.institution, Columbia University
m.07skjzz, education.education.institution, Columbia University
m.0_kwsrp, education.education.institution, Columbia University
m.02wnnlr, education.education.institution, Columbia University
m.02wpfkb, education.education.institution, Columbia University
m.0fpkypr, education.education.institution, Columbia University
m.04yt1bb, education.education.institution, Columbia University
m.0wkdhjh, education.education.institution, Columbia University
m.05yyrw7, education.education.institution, Columbia University
m.04lnjgc, education.education.institution, Columbia University
m.05yyrvk, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbgnv
m.0zfygrt, education.education.institution, Columbia University
m.02wmylf, education.education.institution, Columbia University
m.04fvfmw, education.education.institution, Columbia University
m.09vjksb, education.education.institution, Columbia University
m.02wnzfh, education.education.institution, Columbia University
m.09vjmmt, education.education.institution, Columbia University
m.04lndc4, education.education.institution, Columbia University
m.0n18zhl, education.education.institution, Columbia University
m.04lntgg, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.05yy_mw
Energy development, base.descriptive_names.names.descriptive_name, m.010lbf4j
m.02wnhvc, education.education.institution, Columbia University
m.0svwggr, education.education.institution, Columbia University
m.09hy9ln, education.education.institution, Columbia University
m.02wnqgh, education.education.institution, Columbia University
m.07sk8st, education.education.institution, Columbia University
m.02wmyht, education.education.institution, Columbia University
Energy development, common.topic.notable_for, g.125734_1_
m.04mgssb, education.education.institution, Columbia University
m.06wghph, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Geothermal energy
m.02wnsyt, education.education.institution, Columbia University
m.04yt3ht, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.0_kwcwg
m.09vjnkm, education.education.institution, Columbia University
m.062yxky, education.education.institution, Columbia University
m.02wnmrg, education.education.institution, Columbia University
m.0ghcgdr, education.education.institution, Columbia University
m.02wn54k, education.education.institution, Columbia University
m.0646jkh, education.education.institution, Columbia University
m.02wpgyh, education.education.institution, Columbia University
m.06wgmd3, education.education.institution, Columbia University
m.02wnyh3, education.education.institution, Columbia University
m.04lpfwh, education.education.institution, Columbia University
m.065mtsh, education.education.institution, Columbia University
m.04mbspv, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Wind power
m.02wnplm, education.education.institution, Columbia University
m.05yzcmh, education.education.institution, Columbia University
m.04fntny, education.education.institution, Columbia University
m.04lnh8w, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04htmbx
m.04lnmhy, education.education.institution, Columbia University
m.0ybkkhm, education.education.institution, Columbia University
m.02wnmhd, education.education.institution, Columbia University
m.02wmqhr, education.education.institution, Columbia University
m.02wmxrm, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.02wnsrm
m.02wncd9, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Alternative energy
m.02nstx5, education.education.institution, Columbia University
m.02wncdz, education.education.institution, Columbia University
m.0jzrmbr, education.education.institution, Columbia University
m.02wnylh, education.education.institution, Columbia University
m.02wnx20, education.education.institution, Columbia University
m.02wmrmy, education.education.institution, Columbia University
m.05bbzys, education.education.institution, Columbia University
m.06wgjkk, education.education.institution, Columbia University
m.04fntnq, education.education.institution, Columbia University
m.07ltmvz, education.education.institution, Columbia University
m.02wnyyc, education.education.institution, Columbia University
m.02wnq0s, education.education.institution, Columbia University
m.0jzrmxm, education.education.institution, Columbia University
m.04m11rz, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04hghns
m.04hldyr, education.education.institution, Columbia University
m.04hssbd, education.education.institution, Columbia University
m.05yyqdc, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbfff
Energy development, business.industry.child_industry, Solar thermal energy
m.02wmspw, education.education.institution, Columbia University
m.06wgkff, education.education.institution, Columbia University
m.04hfvbp, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbgbm
m.04hrfcs, education.education.institution, Columbia University
m.0zrjkbl, education.education.institution, Columbia University
m.06zych5, education.education.institution, Columbia University
m.04hfzh2, education.education.institution, Columbia University
m.02wngcq, education.education.institution, Columbia University
m.02wnjkj, education.education.institution, Columbia University
m.02wn52h, education.education.institution, Columbia University
Energy development, business.industry.companies, Unirac
m.02wpt46, education.education.institution, Columbia University
m.0_kwcwg, education.education.institution, Columbia University
m.02wnms6, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbf5k
m.02wnbfn, education.education.institution, Columbia University
m.0gtzddf, education.education.institution, Columbia University
m.04lnrwj, education.education.institution, Columbia University
m.04mbspn, education.education.institution, Columbia University
m.04hgv4w, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.0_kwzyg
m.02wnlvs, education.education.institution, Columbia University
m.04hwbkq, education.education.institution, Columbia University
m.04yxrws, education.education.institution, Columbia University
m.09vjbls, education.education.institution, Columbia University
m.02wnhdd, education.education.institution, Columbia University
m.04m44kr, education.education.institution, Columbia University
m.02wmrzj, education.education.institution, Columbia University
m.04hqnxt, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.0_kwv9b
m.05yymrp, education.education.institution, Columbia University
m.0dlqhft, education.education.institution, Columbia University
m.02wnlsb, education.education.institution, Columbia University
m.05yzqcs, education.education.institution, Columbia University
m.02wnswg, education.education.institution, Columbia University
m.02wpfmz, education.education.institution, Columbia University
m.02wn3gr, education.education.institution, Columbia University
m.0hzhjkd, education.education.institution, Columbia University
m.02wmssd, education.education.institution, Columbia University
m.02wncdp, education.education.institution, Columbia University
m.02wnfcf, education.education.institution, Columbia University
m.02wn85j, education.education.institution, Columbia University
m.0mzvnwc, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.0_kwsrp
m.05yyvvy, education.education.institution, Columbia University
m.0666hnb, education.education.institution, Columbia University
m.04hgkws, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.04hgrtj
m.02wnshy, education.education.institution, Columbia University
m.02wpgmn, education.education.institution, Columbia University
m.02wn39z, education.education.institution, Columbia University
m.02wndtj, education.education.institution, Columbia University
m.02wpf13, education.education.institution, Columbia University
m.02wnhd9, education.education.institution, Columbia University
m.0gmhhpl, education.education.institution, Columbia University
Unirac, business.business_operation.industry, Energy development
m.02wpgrz, education.education.institution, Columbia University
m.02wnczh, education.education.institution, Columbia University
m.02wng16, education.education.institution, Columbia University
m.02wn0db, education.education.institution, Columbia University
m.03hbr86, education.education.institution, Columbia University
m.02wnzyt, education.education.institution, Columbia University
m.04hqnd5, education.education.institution, Columbia University
m.04hgkq7, education.education.institution, Columbia University
m.02wn857, education.education.institution, Columbia University
m.0j31vdq, event.public_speaker.speeches_or_presentations, Barack Obama
m.04fmlls, education.education.institution, Columbia University
m.02wmydf, education.education.institution, Columbia University
m.02wnt12, education.education.institution, Columbia University
m.0czvwch, education.education.institution, Columbia University
Alternative energy, business.industry.parent_industry, Energy development
m.04kfrcj, education.education.institution, Columbia University
m.06zy4kt, education.education.institution, Columbia University
m.04hftxd, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.0jzrmxm
m.0zdgchn, education.education.institution, Columbia University
m.04hghns, education.education.institution, Columbia University
m.04hpnby, education.education.institution, Columbia University
m.012gkyhd, education.education.institution, Columbia University
m.02wnhck, education.education.institution, Columbia University
m.05cmkh1, education.education.institution, Columbia University
m.02wnbdt, education.education.institution, Columbia University
m.0fq7nst, education.education.institution, Columbia University
m.02wn20m, education.education.institution, Columbia University
Energy development, base.descriptive_names.names.descriptive_name, m.010lbg7q
m.04hllds, education.education.institution, Columbia University
m.02wnhrn, education.education.institution, Columbia University
Columbia University, education.educational_institution.students_graduates, m.02wmrmy
m.04m18rd, education.education.institution, Columbia University
m.04md9lt, education.education.institution, Columbia University
m.02wpclt, education.education.institution, Columbia University
m.02gwsts, education.education.institution, Columbia University
m.04yswpn, education.education.institution, Columbia University
m.04hqch7, education.education.institution, Columbia University
m.02wn48x, education.educational_institution.students_graduates, Columbia University
m.02wnwcm, education.education.institution, Columbia University
m.02wn3dp, education.education.institution, Columbia University
m.07sk6nl, education.education.institution, Columbia University
m.02wnbyd, education.education.institution, Columbia University
m.0gmhhpf, education.education.institution, Columbia University
m.06wgfgy, education.education.institution, Columbia University
m.04hgrtj, education.education.institution, Columbia University
m.06zzrmk, education.education.institution, Columbia University
m.02wnnxw, education.education.institution, Columbia University
m.04lncgx, education.education.institution, Columbia University
Energy development, common.topic.article, m.02mg6q
m.0svwtrm, education.education.institution, Columbia University
m.04lnkgc, education.education.institution, Columbia University
m.04hqylt, education.education.institution, Columbia University
m.02wn3d9, education.education.institution, Columbia University
m.02wnlzf, education.education.institution, Columbia University
m.05yzfhd, education.education.institution, Columbia University
m.04htgd6, education.education.institution, Columbia University
m.0hgtgcy, education.education.institution, Columbia University
m.0hgtdrj, education.education.institution, Columbia University
m.04lp47w, education.education.institution, Columbia University
m.09sc80h, education.education.institution, Columbia University
m.04lnyfs, education.education.institution, Columbia University
m.0gmhfls, education.education.institution, Columbia University
m.05yyxgc, education.education.institution, Columbia University
m.02wpfrb, education.education.institution, Columbia University
m.02wnbmy, education.education.institution, Columbia University
m.0hgvzls, education.education.institution, Columbia University
m.02wnbrl, education.education.institution, Columbia University
m.0wzntrp, education.education.institution, Columbia University
m.0znkq0s, education.education.institution, Columbia University
m.06wglbx, education.education.institution, Columbia University
m.0whwcft, education.education.institution, Columbia University
m.02wn2br, education.education.institution, Columbia University
m.04lnzzl, education.education.institution, Columbia University
m.02wppsp, education.education.institution, Columbia University
Energy development, business.industry.child_industry, Solar energy
m.04ysy0h, education.education.institution, Columbia University

Answer: Columbia University