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 's the oakland raiders head coach? 
Knowledge Triplets: Mark Davis, sports.sports_team_owner.teams_owned, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933wx
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngr0
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yqb
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079316m
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.rushing, m.07936rh
Oakland Raiders, american_football.football_team.conference, American Football Conference
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.passing, m.09kngql
Oakland Raiders, sports.professional_sports_team.owner_s, Mark Davis
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcz6
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792yj9
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcp6
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47yh
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_v
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mrk
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk7f
Oakland Raiders at Kansas City Chiefs, 2009-09-20, common.topic.notable_for, g.1257mnmcb
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.passing, m.07mlcnf
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079317b
Oakland Raiders, common.topic.webpage, m.0b46wgg
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk7s
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933xd
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngy_
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mpm
m.04ykh_v, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0793166
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkb0
Oakland Raiders at Denver Broncos, 2009-12-20, american_football.football_game.passing, m.09k0dfg
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mnp
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngxz
m.04ykh_6, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New Orleans Saints, 2008-10-12, american_football.football_game.passing, m.07931rd
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936t0
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47my
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.passing, m.09kngv3
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792yhc
Oakland Raiders at San Diego Chargers, 2009-11-01, common.topic.notable_for, g.125925ww5
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933ls
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.rushing, m.07t47pn
m.011xd62y, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933k0
m.04ykhzg, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlc_l
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933xt
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792ym4
m.04ykh_2, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk3_
m.04ykh_g, american_football.football_historical_coach_position.team, Oakland Raiders
Tony Sparano, american_football.football_coach.current_team_head_coached, Oakland Raiders
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47zw
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzg
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47yv
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07933dx
Oakland Raiders at Buffalo Bills, 2008-09-21, common.topic.notable_for, g.125cbjyly
m.04ykhpk, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47wp
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792ymr
Oakland Raiders at Denver Broncos, 2009-12-20, common.topic.notable_for, g.125h5bprd
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcpx
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0792ygx
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792yl2
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792ypk
m.04ykhz6, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlczk
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.rushing, m.07933jp
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngx8
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld5d
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.rushing, m.07933hz
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.07933y7
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngrq
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47z5
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngrc
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.011xd62y
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0793149
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcyf
m.04ykh_l, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.rushing, m.07t47xg
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.079312d
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0793152
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlc_y
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07936qb
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933__
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0793419
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcr1
Oakland Raiders at Cleveland Browns, 2009-12-27, common.topic.notable_for, g.125512qjl
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794ms2
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47tr
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhz6
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhpk
m.04ykhzv, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngvk
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzq
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.passing, m.07933fr
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk8w
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yng
m.04ykh5s, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcpk
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzz
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngvx
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47x0
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngsr
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcsb
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.passing, m.07933wd
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk63
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk6k
Oakland Raiders at San Diego Chargers, 2008-12-04, common.topic.notable_for, g.1259jczsk
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936sb
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngwl
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk4b
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_g
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzv
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936tc
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0793137
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_b
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkbc
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yqy
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh5s
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.rushing, m.07933h5
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcrp
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.passing, m.0794ml1
Oakland Raiders at Kansas City Chiefs, 2008-09-14, common.topic.notable_for, g.1255g6yhz
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlczx
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk96
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792ykn
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk39
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47vf
m.04226b3, common.webpage.topic, Oakland Raiders
Oakland Raiders, common.topic.webpage, m.04226b3
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcsx
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcql
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngzb
m.04ykhzq, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngs1
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47zj
Oakland Raiders, american_football.football_team.division, AFC West
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47sq
Oakland Raiders at Denver Broncos, 2009-12-20, american_football.football_game.receiving, m.09k0dbm
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mqh
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794mp2
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mly
Oakland Raiders, american_football.football_team.current_head_coach, Tony Sparano
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.079340t
m.04ykh_q, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk83
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47td
Oakland Raiders, common.topic.article, m.05l7c
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.0794msm
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.0792yp2
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk50
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.passing, m.098jk2j
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.passing, m.07mlcys
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.rushing, m.09kngw7
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, common.topic.notable_for, g.1256xh0rg
m.0_msn30, sports.sports_team_coach_tenure.team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngts
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792yk2
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngsd
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcy2
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07936sp
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk8g
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933z8
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlc_7
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.rushing, m.07t47y4
m.04ykhzb, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.season, 2009 NFL season
Oakland Raiders, common.topic.notable_for, g.125bn8614
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.passing, m.0793119
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47v2
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk5s
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933ld
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld50
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngt2
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzl
m.0j34s8p, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.rushing, m.07933gf
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933l1
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mlcxr
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk2z
m.04ykh_b, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mn9
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.receiving, m.07933zw
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.receiving, m.079315n
Oakland Raiders at Kansas City Chiefs, 2008-09-14, american_football.football_game.rushing, m.0792ylr
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.passing, m.07t47nm
Oakland Raiders, american_football.football_coach.current_team_head_coached, Tony Sparano
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mml
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk4p
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47sc
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngyn
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk5c
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933kc
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_q
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngtf
m.04ykhzl, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_l
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.rushing, m.07mlcnw
m.04ykhzz, american_football.football_historical_coach_position.team, Oakland Raiders
Oakland Raiders at Kansas City Chiefs, 2009-09-20, american_football.football_game.receiving, m.07mld5r
Oakland Raiders, sports.sports_team.coaches, m.0_msn30
Oakland Raiders at New York Giants, 2009-10-11, american_football.football_game.receiving, m.07t47t1
Oakland Raiders at San Diego Chargers, 2008-12-04, american_football.football_game.receiving, m.07933kq
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykhzb
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkc1
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_6
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngy9
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.rushing, m.098jk3n
Oakland Raiders at Tampa Bay Buccaneers, 2008-12-28, american_football.football_game.rushing, m.0794mlk
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.0j34s8p
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jk9p
Oakland Raiders at Pittsburgh Steelers, 2009-12-06, american_football.football_game.receiving, m.098jkbq
Oakland Raiders at Denver Broncos, 2009-12-20, american_football.football_game.receiving, m.09k0ddb
Oakland Raiders, american_football.football_team.historical_coaching_staff, m.04ykh_2
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngxm
Oakland Raiders at Cleveland Browns, 2009-12-27, american_football.football_game.receiving, m.09kngwy

Answer: Tony Sparano