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 movies starring Zac Efron were released before 2015? 
Knowledge Triplets: Zac Efron, base.popstra.celebrity.friendship, m.063q1bg
Zac Efron, tv.tv_actor.guest_roles, m.0bmqfgf
m.0ystfbp, film.performance.actor, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0f_spyc
Can I Have This Dance, music.recording.releases, High School Musical 3: Senior Year
Zac Efron's Pool Party, film.film.language, English Language
All for One, music.recording.releases, High School Musical 2
Zac Efron, film.producer.films_executive_produced, That Awkward Moment
Zac Efron, film.actor.film, m.0y5kksv
m.0bf2t7m, film.performance.actor, Zac Efron
m.0jzdys, film.performance.actor, Zac Efron
United States of America, tv.tv_program.country_of_origin, High School Musical 2
Zac Efron, people.person.sibling_s, m.04h665j
Zac Efron 2007, common.image.appears_in_topic_gallery, Zac Efron
m.0b6r919, common.webpage.topic, Zac Efron
Zac Efron, theater.theater_actor.theater_roles, m.0hnflv2
m.094wll6, common.webpage.topic, Zac Efron
m.0gx9343, film.film.starring, If You Lived Here, You'd Be Home Now
m.094s5ht, common.webpage.topic, Zac Efron
Zac Efron, common.topic.webpage, m.094s5ht
Zac Efron, film.actor.film, m.0ng0d3s
Zac Efron, base.popstra.celebrity.wears, m.064tfm7
m.0j_tknw, film.personal_film_appearance.film, Zac Efron's Pool Party
Zac Efron, tv.tv_actor.guest_roles, m.0g07zl9
Zac Efron, base.popstra.celebrity.religion, m.06448wv
Zac Efron, film.actor.film, m.0h8bf2n
Zac Efron, tv.tv_actor.guest_roles, m.0f_xrjx
Emmy Awards; RVs; Actor Zac Efron Of \"Hairspray\", Dave Price,, common.topic.notable_types, TV Episode
Zac Efron, base.popstra.celebrity.friendship, m.065plgv
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h5syps
Zac Efron: The Ultimate Idol, film.film.personal_appearances, m.0cs9nd2
Zac Efron, base.popstra.celebrity.eats_at, m.064tfpw
Zac Efron in ''Me and Orson Welles'', common.resource.annotations, m.0945j6p
Zac Efron, music.artist.track, You Are the Music in Me
Zac Efron, film.actor.film, m.03lrrpp
You Are the Music in Me, music.recording.releases, High School Musical 2
m.0945j6p, common.webpage.resource, Zac Efron in ''Me and Orson Welles''
Zac Efron, people.person.places_lived, m.04h663_
m.0csjrrh, film.personal_film_appearance.person, Zac Efron
m.0y5kksv, film.performance.actor, Zac Efron
The Megamix, music.recording.artist, Zac Efron
Zac Efron, film.actor.film, Jason
Zac Efron, film.actor.film, m.0ystfbp
m.02tbcf3, film.performance.actor, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0g0804v
Starla Baskett, people.person.children, Zac Efron
m.04m556s, film.performance.film, Me and Orson Welles
m.04h66b0, theater.theater_role.actor, Zac Efron
Zac Efron, base.popstra.celebrity.bought, m.064tfqr
Zac Efron, film.performance.actor, m.0gx9343
m.04m556s, film.performance.actor, Zac Efron
United States of America, film.film.country, Me and Orson Welles
m.06520lz, base.popstra.friendship.participant, Zac Efron
Zac Efron, base.popstra.celebrity.friendship, m.06520lz
Zac Efron, common.topic.webpage, m.0942c1d
m.0jz2cl, film.performance.actor, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0dkl9vy
Zac Efron, tv.tv_actor.guest_roles, m.0ng0cm2
m.065pf5x, base.popstra.friendship.participant, Zac Efron
Zac Efron/Yeah Yeah Yeahs, common.topic.notable_for, g.1258dclz6
m.0z8_5pc, award.award_nominated_work.award_nominations, High School Musical 3: Senior Year
m.03lrrpp, film.performance.actor, Zac Efron
Zac Efron, film.actor.film, m.0ng0d9b
m.0z8z2qp, award.award_nomination.nominated_for, High School Musical 3: Senior Year
m.0c0234t, award.award_nomination.nominated_for, 17 Again
m.0gv_vyg, film.performance.actor, Zac Efron
Zac Efron, music.album.artist, Right Here, Right Now
Zac Efron, base.popstra.celebrity.vacations_in, m.064t8lx
m.06449bd, base.popstra.friendship.participant, Zac Efron
Zac Efron, award.award_nominee.award_nominations, m.0z83txc
m.0bgxnb6, tv.tv_guest_role.episodes_appeared_in, Zac Efron, David Walliams, Pet Shop Boys
Zac Efron, tv.tv_actor.guest_roles, m.0ng0bsk
Zac Efron, base.popstra.celebrity.shops_at, m.0644850
Zac Efron, base.popstra.celebrity.eats_at, m.064t7nn
m.0942c1d, common.webpage.topic, Zac Efron
Zac Efron, people.person.religion, Agnosticism
Zac Efron, tv.tv_actor.guest_roles, m.0dkr14g
m.040mbts, film.performance.actor, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0dkqm7x
Zac Efron, base.popstra.celebrity.eats_at, m.064482b
Zac Efron, base.popstra.celebrity.friendship, m.065pg1q
Start of Something New (live), music.recording.artist, Zac Efron
Zac Efron, music.artist.track, High School Musical
Zac Efron, people.person.education, m.0d7mf2v
Zac Efron, tv.tv_actor.guest_roles, m.0bgxnb6
Zac Efron, music.artist.track, Breaking Free (karaoke version)
Zac Efron, theater.theater_actor.theater_roles, m.0hnfjzl
Zac Efron, film.actor.film, m.0hgv8sy
Zac Efron's Pool Party, film.film.personal_appearances, m.0j_tknw
Zac Efron, tv.tv_actor.guest_roles, m.0bgy_1t
Zac Efron, tv.tv_actor.guest_roles, m.0ghjfwc
Zac Efron, tv.tv_actor.guest_roles, m.0dkk9l2
Scream, music.recording.artist, Zac Efron
m.02vcjkf, film.performance.actor, Zac Efron
m.0z8yqg7, award.award_nominated_work.award_nominations, 17 Again
Zac Efron, film.actor.film, g.11b6t78wj1
Zac Efron, base.popstra.celebrity.wears, m.064t949
Work This Out, music.recording.releases, High School Musical 2
Zac Efron, award.award_winner.awards_won, m.0b0bqc6
Zac Efron, film.actor.film, m.04m556s
Zac Efron, people.person.profession, Actor
m.0ng0d9b, film.performance.actor, Zac Efron
Zac Efron, common.topic.article, m.06wm15
Zac Efron, common.topic.webpage, m.0c09s6k
Zac Efron, film.actor.film, m.040mbts
Zac Efron, award.award_honor.award_winner, m.0yh_b3v
Zac Efron, film.actor.film, g.11b76t4_r4
m.0bmqfgf, tv.tv_guest_role.episodes_appeared_in, Emmy Awards; RVs; Actor Zac Efron Of \"Hairspray\", Dave Price,
m.0ng0d3s, film.performance.film, At Any Price
Zac Efron, tv.tv_actor.starring_roles, m.02t8fhd
m.0yh_b3v, award.award_honor.honored_for, 17 Again
m.0hnflv2, theater.theater_role.actor, Zac Efron
Zac Efron, common.topic.image, Zac Efron TIFF08
m.0gwnx6g, film.performance.film, The Lorax
Zac Efron, freebase.valuenotation.is_reviewed, Official website
m.0h5sg58, film.personal_film_appearance.person, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0ng0crb
Zac Efron, tv.tv_actor.guest_roles, m.0ghn0zs
Zac Efron, tv.tv_actor.starring_roles, m.0127582l
Zac Efron, music.artist.track, The Boys Are Back
Zac Efron, base.popstra.celebrity.insult_victim, m.064tf5r
Zac Efron, award.award_nominee.award_nominations, m.0c0234t
Zac Efron, tv.tv_actor.guest_roles, m.0g0mctt
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0j_tknw
Zac Efron, common.topic.webpage, m.0945j6p
Zac Efron, film.actor.film, m.0vb3g8w
Zac Efron, music.artist.contribution, m.0xnr_l9
m.0645lgf, base.popstra.friendship.participant, Zac Efron
Teen idol, base.icons.icon_genre.icons, Zac Efron
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h0xltx
Baas Van 't Hele Spul (Musical Cast Recording), music.recording.artist, Zac Efron
Zac Efron, common.topic.webpage, m.094sb4x
Zac Efron, film.actor.film, m.0vb3g8w
Zac Efron, tv.tv_actor.guest_roles, m.0bms0f1
Zac Efron, tv.tv_actor.guest_roles, m.0dkj619
m.0w1wb8_, film.performance.actor, Zac Efron
Zac Efron, music.artist.track, The Boys Are Back
m.04h66sf, film.performance.actor, Zac Efron
Zac Efron, music.recording.artist, All for One
Zac Efron, music.recording.artist, Work This Out
m.063qqm9, base.popstra.friendship.participant, Zac Efron
m.0z8z1pc, award.award_honor.honored_for, High School Musical 3: Senior Year
Zac Efron, base.popstra.celebrity.bought, m.064t7sq
m.0949vzz, common.webpage.topic, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0g06f5v
Zac Efron, award.award_nominee.award_nominations, m.0wfvq33
Zac Efron, tv.tv_actor.guest_roles, m.0dkskp9
Zac Efron, film.actor.film, m.0bf2t7m
Zac Efron, base.popstra.celebrity.eats_at, m.06448ff
Zac Efron, award.award_nominee.award_nominations, m.0z8_5pc
Zac Efron, film.actor.film, m.03lyytj
Zac Efron, tv.tv_actor.guest_roles, m.0f_svk6
Breaking Free (Remix), music.recording.artist, Zac Efron
m.0h8bf2n, film.performance.actor, Zac Efron
m.0cs9nd2, film.personal_film_appearance.person, Zac Efron
Zac Efron, base.popstra.celebrity.wears, m.064t9dl
Zac Efron, film.actor.film, m.04h66sf
Zac Efron: The Ultimate Idol, film.film.country, United States of America
m.0b3w_t8, award.award_nomination.nominated_for, High School Musical 3: Senior Year
m.065pg1q, base.popstra.friendship.participant, Zac Efron
Zac Efron, David Walliams, Pet Shop Boys, common.topic.notable_types, TV Episode
m.0cs9nd2, film.personal_film_appearance.film, Zac Efron: The Ultimate Idol
The Boys Are Back, music.recording.releases, High School Musical 3: Senior Year
m.011w_f4t, film.performance.actor, Zac Efron
Right Here, Right Now, music.recording.releases, High School Musical 3: Senior Year
Zac Efron, award.award_nominee.award_nominations, m.0b3t__5
United States of America, film.film.country, 17 Again
m.0b3t__5, award.award_nominated_work.award_nominations, High School Musical 3: Senior Year
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h5t7pm
Zac Efron, base.popstra.celebrity.friendship, m.063qqm9
Zac Efron, award.award_nomination.award_nominee, m.0z8yqg7
Zac Efron, tv.tv_actor.guest_roles, m.0ng0cbk
Zac Efron, award.award_honor.award_winner, m.0z8zghf
Zac Efron, base.popstra.celebrity.hangout, m.064tg2v
m.0ng0d3s, film.performance.actor, Zac Efron
Zac Efron, common.topic.webpage, m.0b6r919
Zac Efron, music.artist.track, Scream
A Night to Remember, music.recording.artist, Zac Efron
m.065pmg_, base.popstra.friendship.participant, Zac Efron
m.0xnr_l9, music.recording_contribution.album, High School Musical 2
m.0wfvq33, award.award_nomination.nominated_for, High School Musical 2
That Awkward Moment, film.film.executive_produced_by, Zac Efron
Zac Efron, film.actor.film, m.0ng0dbm
Zac Efron, film.actor.film, m.02tbcf3
United States of America, film.film.country, If You Lived Here, You'd Be Home Now
Zac Efron, tv.tv_actor.guest_roles, m.0g0bd1v
Zac Efron, base.popstra.celebrity.eats_at, m.064t9tz
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h5sg58
United States of America, film.film.country, High School Musical 3: Senior Year
Zac Efron, base.popstra.celebrity.parties, m.064t9wf
Zac Efron, tv.tv_actor.guest_roles, m.0g096ys
Zac Efron, film.actor.film, m.02vcjkf
Zac Efron, base.popstra.celebrity.dated, m.0644877
m.0z8zj69, award.award_nominated_work.award_nominations, 17 Again
m.065pg_m, base.popstra.friendship.participant, Zac Efron
Zac Efron, base.popstra.celebrity.hangout, m.064tg11
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0csjrrh
Breaking Free (karaoke version), music.recording.artist, Zac Efron
Zac Efron, common.topic.webpage, m.0bntdw6
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h7z1d6
Zac Efron, common.topic.webpage, m.094wll6
Zac Efron, tv.tv_actor.guest_roles, m.0g03dch
Zac Efron, tv.tv_actor.guest_roles, m.0f_qpqj
Zac Efron, base.popstra.celebrity.bought, m.064tfr5
Jason, film.performance.actor, Zac Efron
Zac Efron, base.popstra.celebrity.vacations_in, m.064t8p6
Zacefron, common.image.appears_in_topic_gallery, Zac Efron
m.0vb3g8w, film.performance.film, Parkland
m.065plgv, base.popstra.friendship.participant, Zac Efron
Zac Efron, people.person.parents, David Efron
United States of America, film.film.country, At Any Price
m.0vb3g8w, film.performance.actor, Zac Efron
Zac Efron, film.actor.film, m.040mbts
Zac Efron, film.actor.film, m.0gx9343
m.02vcjkf, film.performance.film, High School Musical 2
m.04h66sf, film.performance.film, Melinda's World
m.0bntdw6, common.webpage.topic, Zac Efron
Zac Efron, award.award_nomination.award_nominee, m.0z8zj69
Zac Efron, base.popstra.celebrity.operation, m.064t9c6
m.064t7rh, base.popstra.vacation_choice.vacationer, Zac Efron
m.064495y, base.popstra.friendship.participant, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0ng0csg
Zac Efron, base.popstra.celebrity.bought, m.06449jp
Zac Efron, award.award_nomination.award_nominee, m.0sgl76q
m.0sgl76q, award.award_nominated_work.award_nominations, 17 Again
Zac Efron, people.person.nationality, United States of America
Zac Efron, base.popstra.celebrity.friendship, m.06449bd
Zac Efron, base.popstra.celebrity.vacations_in, m.064t7rh
Zac Efron, base.popstra.celebrity.insult_perpetrator, m.064tf3l
Bet on It, music.recording.releases, High School Musical 2
Zac Efron, music.recording.artist, Bet On It
m.0ng0dbm, film.performance.actor, Zac Efron
Zac Efron, film.actor.film, m.0gx9389
m.0j_tknw, film.personal_film_appearance.person, Zac Efron
Zac Efron, music.artist.track, Without Love
Zac Efron, people.person.education, m.04h66cc
m.0gx9389, film.performance.actor, Zac Efron
Zac Efron, common.topic.image, Zacefron
m.0h5syps, film.personal_film_appearance.person, Zac Efron
What Time Is It, music.recording.releases, High School Musical 2
Zac Efron, base.popstra.celebrity.friendship, m.0645lgf
Zac Efron, base.popstra.celebrity.supporter, m.06449dz
Without Love, music.recording.artist, Zac Efron
m.03lyytj, film.performance.actor, Zac Efron
Zac Efron, common.topic.webpage, m.094dld_
Zac Efron Pictures, common.resource.annotations, m.0c09s6k
Zac Efron, film.actor.film, m.0gwnx6g
Zac Efron, tv.tv_actor.guest_roles, m.0ng0ckp
m.0z8zghf, award.award_winning_work.awards_won, 17 Again
Zac Efron, base.popstra.celebrity.eats_at, m.064tfk7
Zac Efron, tv.tv_actor.guest_roles, m.0g78cl3
Zac Efron, music.artist.track, Breaking Free
Zac Efron, music.recording.artist, Bet on It
United States of America, film.film.country, Parkland
Gotta Go My Own Way, music.recording.releases, High School Musical 2
Zac Efron, people.person.parents, Starla Baskett
United States of America, film.film.country, The Lorax
m.0945j6p, common.webpage.topic, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0ghk9zh
Zac Efron, film.performance.actor, m.0gwnx6g
m.0hgv8sy, film.performance.actor, Zac Efron
m.0hnfjzl, theater.theater_role.actor, Zac Efron
m.03lyytj, film.performance.film, High School Musical 3: Senior Year
The Boys Are Back, music.recording.artist, Zac Efron
Zac Efron, award.award_nominee.award_nominations, m.0b3w_t8
Everyday, music.recording.releases, High School Musical 2
Zac Efron, people.person.profession, Voice Actor
Zac Efron, base.popstra.celebrity.friendship, m.065pg_m
Zac Efron, film.actor.film, m.011w_f4t
Zac Efron, tv.tv_actor.guest_roles, m.0gkgdj3
Zac Efron, base.popstra.celebrity.parties, m.064tf_c
Breaking Free, music.recording.artist, Zac Efron
Zac Efron, film.actor.film, m.0gv_vyg
Zac Efron, base.popstra.celebrity.eats_at, m.064tg54
Zac Efron, base.popstra.celebrity.friendship, m.065pf5x
Zac Efron, music.artist.track, Breaking Free (High School Musical)
m.0h5sxf6, film.personal_film_appearance.person, Zac Efron
Zac Efron, base.popstra.celebrity.friendship, m.064495y
Zac Efron, base.popstra.celebrity.canoodled, m.064t8nx
Zac Efron, base.popstra.celebrity.supporter, m.06449f6
m.0994v27, common.webpage.topic, Zac Efron
m.094sb4x, common.webpage.resource, Trachtenberg, Hardin join Efron in ''17''
Zac Efron, music.artist.track, Everyday
Zac Efron, tv.tv_actor.guest_roles, m.0bmmk67
Zac Efron, common.topic.webpage, m.0949vzz
m.064t8p6, base.popstra.vacation_choice.vacationer, Zac Efron
Zac Efron, common.topic.webpage, m.0994v27
Zac Efron, music.recording.artist, Can I Have This Dance
Zac Efron, award.award_nominee.award_nominations, m.0z8z2qp
Zac Efron, tv.tv_actor.guest_roles, m.0k73p4n
m.0949vld, common.webpage.resource, Zac Efron to star in ''Seventeen''
Zac Efron, common.topic.webpage, m.09475_k
Zac Efron, common.topic.webpage, m.08wwlsx
David Efron, people.person.children, Zac Efron
Hairspray: You Can't Stop the Beat, music.recording.artist, Zac Efron
Zac Efron, Mike Golic and Mike Greenberg, A.C. Newman with Nicole Atkins, common.topic.notable_types, TV Episode
Zac Efron, tv.tv_actor.guest_roles, m.0g01p7v
m.0z83txc, award.award_nominated_work.award_nominations, The Lorax
Zac Efron: The Ultimate Idol, film.film.language, English Language
Zac Efron, tv.tv_actor.guest_roles, m.0ng0cdp
Zac Efron, music.artist.track, We're All in This Together (Graduation mix)
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0h5sxf6
Zac Efron, base.popstra.celebrity.endorsements, m.064t98w
m.0gwnx6g, film.performance.actor, Zac Efron
m.0h5t7pm, film.personal_film_appearance.person, Zac Efron
Zac Efron, film.performance.actor, m.04m556s
m.063q1bg, base.popstra.friendship.participant, Zac Efron
Zac Efron, base.popstra.celebrity.friendship, m.065pmg_
Zac Efron, music.recording.artist, What Time Is It
Zac Efron, film.actor.film, m.0w1wb8_
Zac Efron, people.person.gender, Male
Zac Efron, film.actor.film, m.0ng0d3s
Scream, music.recording.releases, High School Musical 3: Senior Year
m.0gx9343, film.performance.actor, Zac Efron
United States of America, film.film.country, Melinda's World
Zac Efron, tv.tv_actor.guest_roles, m.0g02_3t
Zac Efron, film.actor.film, m.0jz2cl
m.0949vld, common.webpage.topic, Zac Efron
You Are the Music in Me (Sharpay version), music.recording.releases, High School Musical 2
m.040mbts, film.film.starring, 17 Again
Zac Efron, music.recording.artist, Gotta Go My Own Way
Zac Efron, theater.theater_actor.theater_roles, m.04h66b0
Bet On It, music.recording.releases, High School Musical 2
Zac Goes Back, film.film.personal_appearances, m.0h7z1d6
Zac Efron, award.award_honor.award_winner, m.0z8z1pc
Zac Efron, film.actor.film, m.03lyytj
m.0c09s6k, common.webpage.resource, Zac Efron Pictures
Zac Efron, film.actor.film, m.0jzdys
Zac Efron to star in ''Seventeen'', common.resource.annotations, m.0949vld
m.0h7z1d6, film.personal_film_appearance.film, Zac Goes Back
m.0b0bqc6, award.award_honor.honored_for, High School Musical 3: Senior Year
Zac Efron, tv.tv_actor.guest_roles, m.062w2gy
Zac Efron, common.topic.webpage, m.0949vld
Zac Efron, film.actor.film, m.04h66sf
Zac Efron, people.person.places_lived, m.03pq0js
Zac Efron, people.person.place_of_birth, San Luis Obispo
Zac Efron, music.recording.artist, You Are the Music in Me (Sharpay version)
m.064t8nx, base.popstra.canoodled.participant, Zac Efron
Breaking Free (High School Musical), music.recording.artist, Zac Efron
m.0h7z1d6, film.personal_film_appearance.person, Zac Efron
m.0h0xltx, film.personal_film_appearance.person, Zac Efron
m.064t8lx, base.popstra.vacation_choice.vacationer, Zac Efron
Zac Efron, tv.tv_actor.guest_roles, m.0ghkczr
Zac Efron, film.person_or_entity_appearing_in_film.films, m.0cs9nd2
Zac Efron, music.artist.track, Start of Something New (live)
Zac Efron's Pool Party, film.film.country, United States of America
Zac Efron, film.actor.film, m.02vcjkf
Zac Goes Back, film.film.language, English Language
High School Musical, film.film.prequel, High School Musical 2
Zac Efron, music.artist.track, Hairspray: You Can't Stop the Beat
Zac Efron, tv.tv_actor.guest_roles, m.0dk_9mq

Answer: Parkland
The Lorax
17 Again
High School Musical
At Any Price
Melinda's World
Me and Orson Welles
If You Lived Here, You'd Be Home Now
High School Musical 2
High School Musical 3: Senior Year
New Year's Eve
Autobahn
The Lucky One
That Awkward Moment
Neighbors
The Paperboy
Charlie St. Cloud
Robot Chicken: Star Wars Episode III
Miracle Run
The Derby Stallion
Hairspray
Liberal Arts
The Big Wide World of Carl Laemke