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 is the coach of the pittsburgh steelers 2005? 
Knowledge Triplets: Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d6r
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d72
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r6p
Pittsburgh Steelers, american_football.football_team.conference, American Football Conference
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbh0
m.04xwl6m, american_football.football_historical_coach_position.coach, Joe Bach
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbct
Bill Cowher, american_football.football_coach.coaching_history, m.04xwl8h
Pittsburgh Steelers, sports.sports_team.coaches, m.0n7wv_d
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901rjf
m.04xwl6h, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.07926_4
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.07922rt
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r8c
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d7f
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.passing, m.07t48tz
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901rnd
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792mkk
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.rushing, m.07926tg
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvsyb
m.04xwl7c, american_football.football_historical_coach_position.coach, Jim Leonard
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rtv
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl73
m.04xwl6r, american_football.football_historical_coach_position.team, Pittsburgh Steelers
m.04xwl77, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0792c61
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.passing, m.096qb7h
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g386l
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48yg
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl87
m.04xwl6_, american_football.football_historical_coach_position.coach, Bert Bell
Pittsburgh Steelers, sports.professional_sports_team.owner_s, Rooney family
m.04xwl73, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7w
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6c
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.passing, m.07929_b
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.passing, m.07t48my
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.receiving, m.07mlkcz
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g387g
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0792cxc
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0792cx0
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901rg2
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.07926wf
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901qzh
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.passing, m.096qbj1
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792mfr
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0792c4n
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rw6
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wp5
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0791wk0
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.passing, m.0792c0t
m.04xwl6_, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.rushing, m.0792b0h
Pittsburgh Steelers at Philadelphia Eagles, 2008-09-21, american_football.football_game.passing, m.0793j8b
m.04xwl8c, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g3867
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g387t
m.04xwl8h, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.receiving, m.07mlk8y
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.passing, m.0793q3j
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0791wjb
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wkr
Pittsburgh Steelers, american_football.football_historical_coach_position.team, m.04xwl8h
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792cz2
m.05cvv17, american_football.football_historical_coach_position.coach, Mike Tomlin
m.0n7wv_d, sports.sports_team_coach_tenure.coach, Mike Tomlin
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g383r
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48r8
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.passing, m.0792cwl
m.04xwl73, american_football.football_historical_coach_position.coach, Aldo Donelli
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.passing, m.07926mr
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0791wkd
m.05cvsyb, american_football.football_historical_coach_position.coach, Mike Tomlin
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.passing, m.0901rdg
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.07922sk
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792cyd
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl8h
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792c_3
m.04xwl77, american_football.football_historical_coach_position.coach, Walt Kiesling
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wqx
m.04xwl8h, american_football.football_historical_coach_position.coach, Bill Cowher
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792cyr
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792czf
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbr3
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbgg
m.04xwl6w, american_football.football_historical_coach_position.coach, Walt Kiesling
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.passing, m.0792mcn
m.04xwl7_, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901rkn
m.04xwl7h, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d6d
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvsxx
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6m
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792bnc
m.04xwl7c, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7m
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wqh
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvv0z
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901rh5
Mike Tomlin, people.person.profession, Coach
m.04xwl6h, american_football.football_historical_coach_position.coach, Luby DiMeolo
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792bnz
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl8c
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r3d
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.passing, m.0792bks
m.04xwl7r, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792mg8
m.0n7wv_d, sports.sports_team_coach_tenure.team, Pittsburgh Steelers
Mike Tomlin, american_football.football_coach.current_team_head_coached, Pittsburgh Steelers
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g385x
m.04xwl6w, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl83
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48sz
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901ryb
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.passing, m.0901rct
m.04xwl87, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.passing, m.07mljwd
Jim Leonard, american_football.football_coach.coaching_history, m.04xwl7c
m.05cvv0b, american_football.football_historical_coach_position.coach, Mike Tomlin
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48rm
2005 AFC Championship Game, sports.sports_championship_event.runner_up, Pittsburgh Steelers
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0792c5c
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901qzx
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g3831
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6w
m.04xwl83, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.passing, m.07mlk3t
John McNally, american_football.football_coach.coaching_history, m.04xwl6r
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0793q80
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6r
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0792cy1
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0792czs
m.04xwl6c, american_football.football_historical_coach_position.coach, Forrest Douds
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.0792b16
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7h
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.07926x7
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.07922rf
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0792c6m
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.passing, m.09g384f
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbf3
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0791wjp
m.04xwl7_, american_football.football_historical_coach_position.coach, Buddy Parker
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0793q6x
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48y3
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.passing, m.0792c0c
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.receiving, m.07mlk15
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6h
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rvd
m.04xwl7w, american_football.football_historical_coach_position.coach, Walt Kiesling
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.0792719
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wlk
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.0792705
m.04xwl7m, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.07922t3
m.04xwl7w, american_football.football_historical_coach_position.team, Pittsburgh Steelers
m.04xwl7h, american_football.football_historical_coach_position.coach, Jock Sutherland
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.passing, m.0792d47
m.04xwl7m, american_football.football_historical_coach_position.coach, John Michelosen
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48sm
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r9s
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvv17
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0792c3v
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7r
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7_
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl77
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d83
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r21
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbhg
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbfx
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl6_
m.04xwl83, american_football.football_historical_coach_position.coach, Mike Nixon
m.05cvsxx, american_football.football_historical_coach_position.coach, Mike Tomlin
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.rushing, m.0792cxq
m.04xwl6r, american_football.football_historical_coach_position.coach, John McNally
John Michelosen, american_football.football_coach.coaching_history, m.04xwl7m
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.passing, m.09g380w
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rw_
Pittsburgh Steelers, american_football.football_team.current_head_coach, Mike Tomlin
Pittsburgh Steelers at Chicago Bears, 2009-09-20, american_football.football_game.receiving, m.07mlk87
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.passing, m.0791whx
Pittsburgh Steelers at Detroit Lions, 2009-10-11, american_football.football_game.receiving, m.07t48pr
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.0792b1z
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rc3
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.away_team, Pittsburgh Steelers
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.passing, m.0901qyg
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rsm
Pittsburgh Steelers, american_football.football_team.historical_coaching_staff, m.04xwl7c
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rrb
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.07926zd
m.05cvv1h, american_football.football_historical_coach_position.coach, Mike Tomlin
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901r0_
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0793qb5
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792bm_
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g383d
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.07922s5
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901r5w
Pittsburgh Steelers at Jacksonville Jaguars, 2008-10-05, american_football.football_game.receiving, m.0792mj0
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.07926ym
m.04xwl6c, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.passing, m.07922mc
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.receiving, m.0792d7s
Pittsburgh Steelers at Cleveland Browns, 2009-12-10, american_football.football_game.receiving, m.09g3842
Chuck Noll, people.person.profession, Coach
m.04xwl6m, american_football.football_historical_coach_position.team, Pittsburgh Steelers
Pittsburgh Steelers at Washington Redskins, 2008-11-03, american_football.football_game.receiving, m.0793q9b
m.04xwl8h, american_football.football_historical_coach_position.coach, Bill Cowher
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvv1h
m.04xwl7r, american_football.football_historical_coach_position.coach, Joe Bach
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvsys
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.rushing, m.0901r01
m.04xwl8c, american_football.football_historical_coach_position.coach, Chuck Noll
Pittsburgh Steelers at Kansas City Chiefs, 2009-11-22, american_football.football_game.receiving, m.0901rpw
Chuck Noll, american_football.football_coach.coaching_history, m.04xwl8c
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wl2
m.04xwl87, american_football.football_historical_coach_position.coach, Bill Austin
Pittsburgh Steelers at New England Patriots, 2008-11-30, american_football.football_game.receiving, m.0791wmj
Mike Tomlin, american_football.football_coach.coaching_history, m.05cvv0b
m.05cvv0z, american_football.football_historical_coach_position.coach, Mike Tomlin
m.05cvsys, american_football.football_historical_coach_position.coach, Mike Tomlin
Pittsburgh Steelers at Cleveland Browns, 2008-09-14, american_football.football_game.receiving, m.0792b1l
Pittsburgh Steelers at Baltimore Ravens, 2009-11-29, american_football.football_game.receiving, m.096qbrz

Answer: Bill Cowher