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: Who was the coach of the Baltimore Ravens who was also Mayor? 
Knowledge Triplets: Baltimore Ravens at Cleveland Browns, 2009-11-16, common.topic.notable_for, g.1256g41m0
Baltimore Ravens at Green Bay Packers, 2009-12-07, common.topic.notable_for, g.1256dfr8p
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921ws
m.0nhrhj_, sports.sports_team_coach_tenure.team, Baltimore Ravens
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921zh
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_4
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921xm
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.away_team, Baltimore Ravens
m.09ynvv7, common.webpage.topic, Baltimore Ravens
Baltimore Ravens, common.image.appears_in_topic_gallery, Baltimore Ravens
Baltimore Ravens, common.topic.webpage, m.04229n6
m.062_hht, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.passing, m.0792dtd
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcdp
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlccv
m.0_r0s7v, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.home_team, Cleveland Browns
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.079286v
American Football coach, people.person.profession, Randy Brown
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.receiving, m.07921rm
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc9z
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.passing, m.07p5wsk
Baltimore Ravens at Houston Texans, 2008-11-09, common.topic.notable_for, g.1255sgcxy
Baltimore Ravens, sports.sports_team_coach_tenure.team, m.011w_zjc
Baltimore Ravens, sports.sports_team.sport, American football
Baltimore Ravens, american_football.football_team.away_games, Mile High Miracle
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.passing, m.07923p2
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928b1
Baltimore Ravens, sports.sports_team.league, m.0crt9hl
Baltimore Ravens, american_football.football_team.current_head_coach, John Harbaugh
Baltimore Ravens at New England Patriots, 2010-01-10, american_football.football_game.passing, m.09rlsb2
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dwk
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.079287r
m.062_hj8, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bk2
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bbk
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.079286c
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921hc
Baltimore Ravens, american_football.football_team.division, AFC North
Baltimore Ravens, sports.sports_team.league, m.0crtf92
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcc4
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dym
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kng89
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcfp
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, common.topic.notable_for, g.1259v06hm
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921y1
m.09w9wnc, common.webpage.topic, Baltimore Ravens
Baltimore Ravens, sports.sports_team.team_mascot, Conquer
Baltimore Ravens at Miami Dolphins, 2009-01-04, common.topic.notable_for, g.1258jnnkc
Baltimore Ravens, common.topic.image, Baltimore Ravens
Baltimore Ravens, sports.professional_sports_team.owner_s, Steve Bisciotti
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bb4
Steve Bisciotti, sports.sports_team_owner.teams_owned, Baltimore Ravens
Cincinnati Bengals at Baltimore Ravens, 2008-09-07, common.topic.notable_for, g.125bnwwyh
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920qk
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921j3
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_s
Baltimore Ravens, sports.sports_team.colors, Black
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793f_3
Baltimore Ravens, american_football.football_team.away_games, Baltimore Ravens at New York Giants, 2008-11-16
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kng9b
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kngdp
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g0t
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920pv
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.passing, m.09kng64
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fz1
Baltimore Ravens, sports.sports_team.coaches, m.0nhrhj_
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288x
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxr
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.0793fwt
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mlj62
Wayne Evans, fictional_universe.fictional_character.gender, Male
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921m9
Baltimore Ravens, common.topic.notable_for, g.1258t61gm
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.07923vw
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920sy
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxc
Baltimore Ravens, common.topic.webpage, m.09w9wnc
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.07923w8
m.062_hjj, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920rr
Conquer, sports.mascot.team, Baltimore Ravens
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921l7
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920pf
Coach, people.profession.specializations, American Football coach
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc8z
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kx
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.07923vc
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920sl
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.07925gq
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bh4
Baltimore Ravens, sports.sports_team.colors, White
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.079226w
Jim Caldwell, people.person.profession, Coach
Baltimore Ravens at Dallas Cowboys, 2008-12-20, common.topic.notable_for, g.1255cshr8
Kansas City Chiefs at Baltimore Ravens, 2009-09-13, common.topic.notable_for, g.1259t82yt
Baltimore Ravens at New England Patriots, 2010-01-10, common.topic.notable_for, g.1254zjjl3
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.079226d
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kk
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.season, 2008 NFL season
John Harbaugh, people.person.profession, Coach
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc9g
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bj6
m.062_hj0, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens at New England Patriots, 2009-10-04, common.topic.notable_for, g.1256xshrh
Baltimore Ravens, sports.sports_team.colors, Gold
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.07920nz
Baltimore Ravens, sports.sports_team.team_mascot, Rise
Baltimore Ravens, american_football.football_team.conference, American Football Conference
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kngc_
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlckm
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920r8
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlcgv
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.0792b9p
Baltimore Ravens at Tennessee Titans, 2009-01-10, common.topic.notable_for, g.1257dslcn
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288k
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcd6
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.07925h4
Baltimore Ravens, common.topic.notable_types, American football team
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.away_team, Baltimore Ravens
Baltimore Ravens, sports.sports_team.fight_song, Ravenation
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.home_team, New York Giants
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g09
m.0nhrhj_, sports.sports_team_coach_tenure.coach, Jim Caldwell
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcbt
Baltimore Ravens, sports.sports_team.team_mascot, Poe
Baltimore Ravens at Miami Dolphins, 2008-10-19, common.topic.notable_for, g.1255yz505
m.011w_zjc, sports.sports_team_coach_tenure.coach, Randy Brown
Baltimore Ravens, american_football.football_team.away_games, Baltimore Ravens at Pittsburgh Steelers, 2008-09-29
Baltimore Ravens, american_football.football_team.away_games, Baltimore Ravens at Cleveland Browns, 2008-11-02
Baltimore Ravens, sports.sports_team.league, m.0crt4nx
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bjl
m.04229n6, common.webpage.topic, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bcp
Mayor, fictional_universe.fictional_character.occupation, Wayne Evans
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.0792g7h
Baltimore Ravens, common.image.size, m.01x3nyz
m.011w_zjc, sports.sports_team_coach_tenure.team, Baltimore Ravens
m.0jbcqw9, film.personal_film_appearance.person, Baltimore Ravens
Baltimore Ravens at Green Bay Packers, 2009-12-07, american_football.football_game.passing, m.098jnth
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jh
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dxy
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bb_
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fzj
Male, people.person.gender, Randy Brown
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlc8m
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlchg
Baltimore Ravens at New York Giants, 2008-11-16, common.topic.notable_for, g.1256z3vg3
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, common.topic.notable_for, g.12554g3x2
Cleveland Browns at Baltimore Ravens, 2009-09-27, common.topic.notable_for, g.1258jnnv9
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fyl
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.07921v3
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921lv
Baltimore Ravens, sports.sports_team.coaches, m.011w_zjc
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792877
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079289p
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921x6
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928bn
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.receiving, m.07925kr
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bfk
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.home_team, Pittsburgh Steelers
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kng8_
Baltimore Ravens, common.topic.webpage, m.0b45wx5
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.rushing, m.07923pl
Baltimore Ravens, symbols.namesake.named_after, The Raven
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kngfc
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792884
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921yz
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.0792898
John Harbaugh, american_football.football_coach.current_team_head_coached, Baltimore Ravens
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcch
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, common.topic.notable_for, g.1256dfq_b
Jack Harbaugh, people.person.profession, Coach
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.079220n
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921k6
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.07921gw
Baltimore Ravens at San Diego Chargers, 2009-09-20, common.topic.notable_for, g.125cbz_15
m.0n_xsm9, american_football.football_historical_coach_position.team, Baltimore Ravens
Baltimore Ravens, american_football.football_team.away_games, Baltimore Ravens at Cleveland Browns, 2009-11-16
Baltimore Ravens, common.topic.webpage, m.09ynvv7
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.home_team, Cleveland Browns
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcf4
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jw
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlchx
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dwx
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlcg3
Baltimore Ravens, common.topic.article, m.01ctj
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlcbg
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.passing, m.09kngbj
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.0n_xsm9
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dxl
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dw6
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlcjy
Baltimore Ravens, sports.sports_team.fight_song, For Baltimore
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kngdb
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.062_hj0
Baltimore Ravens at Cleveland Browns, 2008-11-02, common.topic.notable_for, g.1254zbtnw
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, common.topic.notable_for, g.125b1mr5x
Baltimore Ravens, sports.sports_team.location, Baltimore
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.rushing, m.08nlcj8
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.07923tk
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dx7
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bg6
Rise, sports.mascot.team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.07920s5
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0792207
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.away_team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920q5
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fy4
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.passing, m.08nlc80
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921w0
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.062_hht
Baltimore Ravens at New England Patriots, 2009-10-04, american_football.football_game.passing, m.07p5wzx
m.0b45wx5, common.webpage.topic, Baltimore Ravens
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.062_hjj
Baltimore Ravens, common.topic.webpage, m.0g9fn36
Coach, sports.sports_team_coach_tenure.position, m.011w_zjc
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.07920qy
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.062_hj8
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g15
m.0g9fn36, common.webpage.topic, Baltimore Ravens
Cleveland Browns at Baltimore Ravens, 2008-09-21, common.topic.notable_for, g.125689xb3
Baltimore Ravens at Pittsburgh Steelers, 2009-12-27, american_football.football_game.receiving, m.09kng8n
Baltimore Ravens, american_football.football_team.historical_coaching_staff, m.0_r0s7v
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.away_team, Baltimore Ravens
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mljjv
Poe, sports.mascot.team, Baltimore Ravens
Coach, fictional_universe.fictional_character.gender, Male
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlck8
For Baltimore, sports.fight_song.sports_team, Baltimore Ravens
Baltimore Ravens at Pittsburgh Steelers, 2009-01-18, american_football.football_game.receiving, m.0792dy8
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bdq
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bhs
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921hr
Baltimore Ravens at Cleveland Browns, 2009-11-16, american_football.football_game.receiving, m.08nlckz
Baltimore Ravens at San Diego Chargers, 2009-09-20, american_football.football_game.passing, m.07mljkv

Answer: Randy Brown