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: Which coach of the Carolina Panthers has their roster position as defensive back? 
Knowledge Triplets: Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079457x
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg8y
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q580
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079490b
Carolina Panthers, sports.sports_team.sport, American football
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfxt
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf5w
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946yr
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.passing, m.07946rs
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfyw
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.passing, m.07948xb
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947ww
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q56r
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.away_team, Carolina Panthers
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947xp
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yl
Carolina Panthers, sports.sports_team.league, m.0crt4n3
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079492k
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38gy
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.passing, m.09g38cr
m.0_3r22s, sports.sports_team_coach_tenure.coach, John Fox
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38f6
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knfbs
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949wd
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.079480k
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jx6
Carolina Panthers, sports.sports_team.coaches, m.0_3r22s
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794925
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.passing, m.0794jmf
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h3b
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf6k
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q527
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794560
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q567
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, common.topic.notable_for, g.1259jc_0f
m.0_3r22s, sports.sports_team_coach_tenure.team, Carolina Panthers
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.passing, m.07mlfpf
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knfb2
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38h8
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38fx
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q578
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jtp
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfx3
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at San Diego Chargers, 2008-09-07
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q58p
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079458x
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg47
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38hz
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946xc
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkxz
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg5w
Defensive back, american_football.football_player.position_s, John Fox
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.passing, m.07vr5pk
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.rushing, m.079343g
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf5j
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.receiving, m.07vr5td
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079348b
Carolina Panthers, sports.professional_sports_team.owner_s, Jerry Richardson
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkwy
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.passing, m.0793gzh
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079346z
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g389n
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg55
Philadelphia Eagles at Carolina Panthers, 2009-09-13, common.topic.notable_for, g.125cw4kn6
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knfbf
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jxs
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.passing, m.09knf6x
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079456x
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.rushing, m.07947wg
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Oakland Raiders, 2008-11-09
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38bb
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h4j
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.rushing, m.07946sm
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079347v
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g389_
m.04xg_yc, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.rushing, m.079343w
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkx8
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.07948_x
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf55
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jw1
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.receiving, m.07vr5mh
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, common.topic.notable_for, g.12595j_by
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h3r
Carolina Panthers at Dallas Cowboys, 2009-09-28, common.topic.notable_for, g.125crtfpw
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf9r
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079491s
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g388z
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf9d
Carolina Panthers, common.topic.article, m.01y3n
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfyh
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079455d
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf4v
m.04xg_yl, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g388m
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.passing, m.098jkpg
Carolina Panthers, american_football.football_team.division, NFC South
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkw6
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q59j
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.04xg_yc
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38dw
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38bp
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h34
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.passing, m.096q540
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38fk
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079348r
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.07949zh
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946wz
Carolina Panthers at Atlanta Falcons, 2008-11-23, common.topic.notable_for, g.125gpgwjb
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.receiving, m.07vr5tr
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h2d
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.passing, m.07vr5k3
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079458k
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, common.topic.notable_for, g.125fg890p
Carolina Panthers at New York Giants, 2008-12-21, common.topic.notable_for, g.1258b__jn
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38c0
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkxm
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfz6
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jww
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g3899
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.passing, m.098jkt1
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38gl
Carolina Panthers at Green Bay Packers, 2008-11-30, american_football.football_game.receiving, m.079497s
Carolina Panthers, common.topic.notable_for, g.1259dwnz3
John Fox, american_football.football_player.position_s, Defensive back
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.receiving, m.07vr5sc
Carolina Panthers, sports.sports_team_coach_tenure.team, m.0_3r22s
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38d5
Carolina Panthers, american_football.football_historical_coach_position.team, m.0j81th4
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.passing, m.096q4xc
Carolina Panthers at New England Patriots, 2009-12-13, common.topic.notable_for, g.125f5f2lb
Carolina Panthers, sports.sports_team.league, m.0crt99h
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38cc
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947z7
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794803
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946y5
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949sz
Defensive back, sports.sports_position.sport, American football
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946v_
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.0794915
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794810
Carolina Panthers, american_football.football_team.current_head_coach, Ron Rivera
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38hm
Carolina Panthers, sports.sports_team.sport, American football
Carolina Panthers at New York Giants, 2009-12-27, common.topic.notable_for, g.125fbm304
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New England Patriots, 2009-12-13
Carolina Panthers at Green Bay Packers, 2008-11-30, american_football.football_game.receiving, m.0794966
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h4m
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946zb
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2009-11-08
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jksc
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h43
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jwg
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947_m
Carolina Panthers at Atlanta Falcons, 2008-11-23, american_football.football_game.receiving, m.079454s
Jerry Richardson, sports.sports_team_owner.teams_owned, Carolina Panthers
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf91
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949vx
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.passing, m.09g3885
Ron Rivera, american_football.football_coach.current_team_head_coached, Carolina Panthers
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.passing, m.07947tn
American football, sports.sport.team_coaches, John Fox
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jky9
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947_4
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.rushing, m.09g38dj
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg3j
m.0422g9r, common.webpage.topic, Carolina Panthers
Carolina Panthers at Tampa Bay Buccaneers, 2009-10-18, american_football.football_game.receiving, m.07vr5nj
Washington Redskins at Carolina Panthers, 2009-10-11, common.topic.notable_for, g.125dln6cx
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.passing, m.0793421
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg66
m.0j81th4, american_football.football_historical_coach_position.team, Carolina Panthers
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q5b5
Carolina Panthers at Atlanta Falcons, 2009-09-20, common.topic.notable_for, g.125cnxp6m
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.07947yf
Carolina Panthers at New York Jets, 2009-11-29, american_football.football_game.receiving, m.096q50b
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h2b
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.07946xs
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.rushing, m.079342k
Carolina Panthers, american_football.football_team.historical_coaching_staff, m.0j81th4
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2008-11-23
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.receiving, m.0794h1c
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkvw
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949v2
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfxg
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at New Orleans Saints, 2008-12-28
Carolina Panthers at Green Bay Packers, 2008-11-30, american_football.football_game.receiving, m.075rsby
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.passing, m.07mlg1g
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlfy4
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.07949rz
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.0793455
Carolina Panthers at New Orleans Saints, 2008-12-28, american_football.football_game.passing, m.07949x6
Carolina Panthers, common.topic.webpage, m.0422g9r
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jvn
Carolina Panthers, sports.sports_team.league, m.0crtfg9
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg4v
Carolina Panthers at New York Giants, 2009-12-27, american_football.football_game.receiving, m.09knf4h
m.0j81th4, american_football.football_historical_coach_position.coach, John Fox
Carolina Panthers, american_football.football_team.away_games, Carolina Panthers at Atlanta Falcons, 2009-09-20
Carolina Panthers at Atlanta Falcons, 2009-09-20, american_football.football_game.receiving, m.07mlg5j
Carolina Panthers at New England Patriots, 2009-12-13, american_football.football_game.receiving, m.09g38g7
Carolina Panthers at Tampa Bay Buccaneers, 2008-10-12, american_football.football_game.receiving, m.0794jy6
Carolina Panthers at New York Giants, 2008-12-21, american_football.football_game.receiving, m.0793h1r
Carolina Panthers at San Diego Chargers, 2008-09-07, american_football.football_game.receiving, m.079345r
Tampa Bay Buccaneers at Carolina Panthers, 2009-12-06, american_football.football_game.receiving, m.098jkrb
Carolina Panthers, american_football.football_team.conference, National Football Conference

Answer: John Fox