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: When was the first championship won by the team whose mascot is Benny the Bull? 
Knowledge Triplets: Chicago Bulls, sports.sports_team.roster, m.0z4g597
m.09ys4jb, common.webpage.topic, Chicago Bulls
m.0k78jl9, sports.sports_team_roster.team, Chicago Bulls
m.0j2gkjp, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, award.award_winner.awards_won, m.0sgp_5x
m.011vfcp4, sports.sports_team_roster.team, Chicago Bulls
Mascot, freebase.type_profile.strict_included_types, Topic
m.0_qwlmx, award.award_honor.award_winner, Chicago Bulls
m.01067h3q, sports.sports_team_roster.team, Chicago Bulls
m.0115tn9k, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.04g36nj
Chicago Bulls, sports.sports_team.roster, m.01153zzf
Mascot, freebase.type_hints.included_types, Topic
m.04_ngxc, sports.sports_league_draft_pick.team, Chicago Bulls
m.0_vxlv5, sports.sports_team_roster.team, Chicago Bulls
m.04_bzgy, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_tsyq_
Benny.jpg, common.image.size, m.0kksz7
m.04g36nj, sports.sports_team_roster.team, Chicago Bulls
Team Mascot, rdf-schema#range, Mascot
Chicago Bulls, sports.professional_sports_team.draft_picks, m.04_bxx0
m.0sgppl9, award.award_nomination.award_nominee, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0k6g8_z
Chicago Bulls, sports.sports_team.roster, m.0rg45gf
Chicago Bulls, sports.professional_sports_team.owner_s, James D. Stern
m.0n5pkgg, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0k6xy8l
m.0w2vhj8, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0z45_mx
Chicago Bulls, sports.sports_team.roster, m.0n4pby4
Chicago Bulls, sports.sports_team.roster, m.01143jp_
Chicago Bulls, award.award_winner.awards_won, m.0_qwm13
Chicago Bulls, sports.sports_team.roster, m.0k0wjf2
Chicago Bulls, sports.sports_team.roster, m.0w2mrm5
Chicago Bulls, sports.sports_team.roster, m.02398hd
1992 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0ztzxpf
m.0zn6jb8, sports.sports_team_roster.team, Chicago Bulls
m.02nqxdf, sports.sports_league_draft_pick.team, Chicago Bulls
m.0crt3j2, sports.sports_league_participation.team, Chicago Bulls
Chicago Bulls, sports.sports_team.championships, 1991 NBA Finals
Benny the Bull, sports.mascot.team, Chicago Bulls
Chicago Bulls, basketball.basketball_team.head_coach, Tom Thibodeau
Chicago Bulls, award.award_winner.awards_won, m.0_qwm1y
m.0cg4kqv, basketball.basketball_historical_coach_position.team, Chicago Bulls
m.0rq37fm, sports.sports_team_roster.team, Chicago Bulls
Mascot, common.topic.article, m.02ht4bx
Chicago Bulls, sports.sports_team.roster, m.0pd5y2c
Benny the Bull, common.topic.notable_for, g.1257mn5nq
m.0cg4jtj, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.championships, 1991 NBA Finals
m.0z45n5g, sports.sports_team_roster.team, Chicago Bulls
m.0ydxk6v, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, award.award_winner.awards_won, m.0_qwm29
Chicago Bulls, sports.sports_team.roster, m.0n9ct10
m.0k78jly, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0j2k_y1
m.0sxgz72, sports.sports_team_roster.team, Chicago Bulls
m.0w2mrm5, sports.sports_team_roster.team, Chicago Bulls
m.04_bzjk, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_0517q
m.0j2gr4w, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.professional_sports_team.draft_picks, m.02nqxbv
Mascot, freebase.type_profile.kind, Title
m.04_nfz4, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago, base.biblioness.bibs_topic.is_really, Chicago
Chicago Bulls, sports.sports_team.roster, m.0z464sg
m.0wz1zmn, sports.team_venue_relationship.team, Chicago Bulls
m.0n4pby4, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.01067h3q
Chicago Bulls, sports.sports_team.roster, m.02397ys
m.0n9ctft, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0110xyj8
m.0kby110, sports.sports_team_roster.team, Chicago Bulls
Benny the Bull 1a, common.image.appears_in_topic_gallery, Benny the Bull
m.0_qwm13, award.award_honor.award_winner, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0kby110
m.0z46b27, sports.sports_team_roster.team, Chicago Bulls
Sports, type.domain.types, Professional Sports Team
Chicago Bulls, sports.sports_team.roster, m.0cg4jt9
Chicago Bulls, sports.sports_team.roster, m.011x2gfr
Chicago Bulls, basketball.basketball_team.previous_coaches, m.0cg4k6_
Chicago Bulls, sports.sports_team.roster, m.0rq37fm
Chicago Bulls, sports.professional_sports_team.draft_picks, m.02nqxfm
Chicago Bulls, sports.sports_team.roster, m.01085k_5
Chicago Bulls, sports.professional_sports_team.owner_s, Jerry Reinsdorf
Chicago Bulls, award.award_nominee.award_nominations, m.0sgp_6q
United Center, sports.sports_facility.home_venue_for, m.0wz1zmn
Team Mascot, type.property.reverse_property, Team
Chicago Bulls, sports.sports_team.championships, 1998 NBA Finals
Chicago Bulls, common.topic.image, 180px-Chicago Bulls logo.png
m.0sgpss1, award.award_honor.award_winner, Chicago Bulls
m.0114cs_j, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.sport, Basketball
Professional Sports Team, type.type.domain, Sports
m.0_tsyq_, sports.sports_team_roster.team, Chicago Bulls
Professional Sports Team, freebase.type_profile.strict_included_types, Topic
m.011x2dkv, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_qw01r
m.0z45_mx, sports.sports_team_roster.team, Chicago Bulls
m.011x2f0z, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.championships, 1993 NBA Finals
Chicago Bulls, common.topic.webpage, m.0422cnz
m.0sgpp36, award.award_honor.award_winner, Chicago Bulls
m.0z464sg, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0xncf94
Chicago Bulls, sports.sports_team.roster, m.0cg4jt2
Chicago Bulls, sports.professional_sports_team.draft_picks, m.02h7cgv
m.08s46fb, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_qwx1g
Sports, type.domain.types, Mascot
Chicago Bulls, common.topic.webpage, m.09y96gq
Chicago Bulls, sports.sports_team.roster, m.0j2gbt8
m.02nqxfm, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0kdt36q
Chicago Bulls, sports.sports_team.roster, m.0k4w805
m.02397qx, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0z462yv
Chicago Bulls, sports.sports_team.team_mascot, Benny the Bull
Chicago Bulls, award.award_winner.awards_won, m.0sgpp36
m.0_qwx1g, sports.sports_team_roster.team, Chicago Bulls
Team, type.property.master_property, Team Mascot
Chicago Bulls, basketball.basketball_team.division, Central Division
Chicago Bulls, sports.sports_team.roster, m.0kb5czr
Mascot, freebase.type_profile.published, Published
Chicago Bulls, sports.sports_team.roster, m.04g36ns
Chicago Bulls, sports.sports_team.roster, m.011x2dkv
m.0k0wjf2, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0h6lfyf
Chicago, sports.sports_team_location.teams, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.011vfcp4
Chicago Bulls, sports.sports_team.championships, 1997 NBA Finals
m.0kb5czr, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0j2gqt8
m.01143jp_, sports.sports_team_roster.team, Chicago Bulls
m.0j2h2qt, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.011x2f0z
m.0_qzwqd, sports.sports_team_roster.team, Chicago Bulls
m.0w5g0g4, sports.sports_team_roster.team, Chicago Bulls
m.0_qw01r, sports.sports_team_roster.team, Chicago Bulls
1997 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0k78jly
m.0_qwm29, award.award_honor.award_winner, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0cg4jtj
Chicago Bulls, sports.professional_sports_team.draft_picks, m.04_ngxc
Chicago Bulls, sports.sports_team.roster, m.0sgw3v3
m.0z85h_s, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0w2vhj8
m.0110p67h, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0115tn9k
Central Division, basketball.basketball_division.teams, Chicago Bulls
m.0n9ct10, sports.sports_team_roster.team, Chicago Bulls
Central Division, basketball.basketball_division.conference, Eastern Conference
Chicago Bulls, sports.sports_team.roster, m.01067k9l
m.0n65ds2, sports.sports_team_roster.team, Chicago Bulls
m.0j2k_y1, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0z85h_s
m.0sgp_6q, award.award_nomination.award_nominee, Chicago Bulls
m.0_0517q, sports.sports_team_roster.team, Chicago Bulls
Benny the Bull, sports.mascot.team, Chicago Bulls
m.0k4w805, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, award.award_winner.awards_won, m.0_qwlls
Chicago Bulls, sports.sports_team.roster, m.0w5g0g4
m.0_92ltn, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.professional_sports_team.draft_picks, m.0110xyqh
m.02h7cgv, sports.sports_league_draft_pick.team, Chicago Bulls
1993 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
Chicago Bulls, sports.sports_team.arena_stadium, United Center
Chicago Bulls, sports.sports_team.roster, m.0kb5cly
Benny.jpg, common.image.appears_in_topic_gallery, Benny the Bull
1998 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0110p67h
m.04_bxx0, sports.sports_league_draft_pick.team, Chicago Bulls
m.011x2gfr, sports.sports_team_roster.team, Chicago Bulls
m.0n4hjjn, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, award.award_nominee.award_nominations, m.0sgppl9
m.0sgw3v3, sports.sports_team_roster.team, Chicago Bulls
m.0j2gbt8, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.02397qx
Chicago Bulls, sports.professional_sports_team.draft_picks, m.04_bzjk
m.0sgp_5x, award.award_honor.award_winner, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0ydxk6v
Chicago Bulls, sports.sports_team.roster, m.0sxgz72
Chicago Bulls, award.award_winner.awards_won, m.0_qwlmx
Chicago Bulls, sports.sports_team.roster, m.08s46fb
m.01067k9l, sports.sports_team_roster.team, Chicago Bulls
m.0n4pfnp, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0j2qm_p
m.0422cnz, common.webpage.topic, Chicago Bulls
m.04g36ns, sports.sports_team_roster.team, Chicago Bulls
m.0j2qm_p, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0j2gr4w
Chicago Bulls, common.topic.notable_types, Professional Sports Team
Benny the Bull 1a, common.image.size, m.059_28v
m.0n4fz5j, sports.sports_team_roster.team, Chicago Bulls
Mascot, type.type.expected_by, Team Mascot
Team, type.property.schema, Mascot
Mascot, freebase.documented_object.documentation, m.02ht4bx
Chicago Bulls, sports.sports_team.roster, m.0zn6jb8
m.0kdt36q, sports.sports_team_roster.team, Chicago Bulls
m.0wz1zmn, sports.team_venue_relationship.venue, United Center
Chicago Bulls, sports.sports_team.roster, m.0n9ctft
m.0_qwm1y, award.award_honor.award_winner, Chicago Bulls
Eastern Conference, basketball.basketball_conference.teams, Chicago Bulls
Chicago Bulls, sports.sports_team.colors, White
m.0j2gqt8, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.professional_sports_team.draft_picks, m.04_bzgy
Chicago Bulls, sports.professional_sports_team.draft_picks, m.02nqxdf
m.0ztzh8f, sports.sports_team_roster.team, Chicago Bulls
m.01085k_5, sports.sports_team_roster.team, Chicago Bulls
m.0cg4jt2, sports.sports_team_roster.team, Chicago Bulls
m.0105_h_f, sports.sports_team_roster.team, Chicago Bulls
m.0rg45gf, sports.sports_team_roster.team, Chicago Bulls
Team Mascot, owl#inverseOf, Team
m.0j2gbxk, sports.sports_team_roster.team, Chicago Bulls
United Center, location.location.containedby, Chicago
Chicago Bulls, sports.sports_team.roster, m.0ztzh8f
m.01153zzf, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, common.topic.notable_for, g.1259vyfty
James D. Stern, sports.sports_team_owner.teams_owned, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0n4fz8r
m.0z461q_, sports.sports_team_roster.team, Chicago Bulls
m.0110xyj8, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0j2gbxk
Benny the Bull, common.topic.article, m.067z_q
Benny the Bull, common.topic.image, Benny.jpg
m.0k6xy8l, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.colors, Red
Chicago Bulls, sports.sports_team.championships, 1992 NBA Finals
m.0z3wh25, sports.sports_team_roster.team, Chicago Bulls
m.0pd5y2c, sports.sports_team_roster.team, Chicago Bulls
Team, rdf-schema#domain, Mascot
Benny the Bull, common.topic.notable_types, Mascot
m.0z4g597, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.location, Chicago
1996 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
m.09kmjqn, base.ontologies.ontology_instance_mapping.freebase_topic, Chicago Bulls
Chicago Bulls, sports.sports_team.championships, 1996 NBA Finals
Chicago Bulls, sports.sports_team.roster, m.0n5pkgg
m.0cg4jt9, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0n4pfnp
m.0110xyqh, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_qzwqd
Chicago Bulls, sports.sports_team.roster, m.0n65ds2
m.08s46dp, sports.sports_team_roster.team, Chicago Bulls
United Center, sports.sports_facility.teams, Chicago Bulls
Chicago, location.hud_county_place.place, Chicago
Chicago Bulls, sports.sports_team.roster, m.0105h9j4
Chicago Bulls, award.award_winner.awards_won, m.0sgpss1
m.0z462yv, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, award.award_winner.awards_won, m.0_qwlgz
Chicago Bulls, sports.sports_team.roster, m.0j2gqq2
m.0105h9j4, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, base.ontologies.ontology_instance.equivalent_instances, m.09kmjqn
Jerry Reinsdorf, sports.sports_team_owner.teams_owned, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0114cs_j
Chicago Bulls, sports.sports_team.roster, m.0z461q_
Chicago Bulls, sports.sports_team.roster, m.0z45n5g
Topic, freebase.type_profile.published, Published
m.02398hd, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0k78jl9
m.0kbm8gl, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0_vxlv5
Benny the Bull, common.topic.image, Benny the Bull 1a
m.02397ys, sports.sports_team_roster.team, Chicago Bulls
m.09y96gq, common.webpage.topic, Chicago Bulls
Chicago Bulls, common.topic.webpage, m.09ys4jb
Chicago Bulls, sports.sports_team.roster, m.0j2gkjp
m.0_qwlls, award.award_honor.award_winner, Chicago Bulls
Chicago Bulls, sports.sports_team.league, m.0crt3j2
Chicago Bulls, sports.sports_team.roster, m.0_92ltn
m.0cg4k6_, basketball.basketball_historical_coach_position.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0n4hjjn
m.0xncf94, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, basketball.basketball_team.conference, Eastern Conference
Benny the Bull, common.topic.article, m.0bbgr_
Mascot, type.type.expected_by, sports_team_mascot
m.02nqxbv, sports.sports_league_draft_pick.team, Chicago Bulls
Chicago Bulls, common.topic.article, m.0jm7g
Mascot, freebase.type_profile.equivalent_topic, Mascot
Chicago Bulls, sports.sports_team.roster, m.0105_h_f
Chicago Bulls, sports.sports_team.roster, m.0j2h2qt
Chicago Bulls, sports.sports_team.roster, m.08s46dp
Eastern Conference, basketball.basketball_conference.divisions, Central Division
m.0n4fz8r, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.professional_sports_team.draft_picks, m.04_nfz4
m.0k6g8_z, sports.sports_team_roster.team, Chicago Bulls
Professional Sports Team, freebase.type_hints.included_types, Topic
Chicago Bulls, sports.sports_team.roster, m.0kbm8gl
m.0h6lfyf, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, basketball.basketball_team.previous_coaches, m.0cg4kqv
m.0ztzxpf, sports.sports_team_roster.team, Chicago Bulls
m.0j2gqq2, sports.sports_team_roster.team, Chicago Bulls
m.0kb5cly, sports.sports_team_roster.team, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0n4fz5j
Chicago Bulls, sports.sports_team.colors, Black
m.0n4kzsd, sports.sports_team_roster.team, Chicago Bulls
Tom Thibodeau, basketball.basketball_coach.team, Chicago Bulls
Mascot, type.type.domain, Sports
Chicago Bulls, sports.sports_team.venue, m.0wz1zmn
Chicago, base.biblioness.bibs_topic.subsumes, Chicago
Team Mascot, type.property.expected_type, Mascot
Chicago Bulls, sports.sports_team.roster, m.0z46b27
1991 NBA Finals, sports.sports_championship_event.champion, Chicago Bulls
m.0_qwlgz, award.award_honor.award_winner, Chicago Bulls
Chicago Bulls, sports.sports_team.roster, m.0z3wh25
Chicago Bulls, sports.sports_team.roster, m.0n4kzsd
Mascot, type.type.properties, Team

Answer: 1991 NBA Finals