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 player who started his career in 2008 and is a 2012 Ravens quarterback? 
Knowledge Triplets: Philadelphia Eagles at Baltimore Ravens, 2008-11-23, american_football.football_game.passing, m.0793lb6
m.096qb7h, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07923j8
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.079226d
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bb4
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07z2j2m
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cf1
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.079220n
m.0792135, american_football.game_passing_statistics.player, Joe Flacco
m.09rlsb2, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.0792b9p
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jh
Baltimore Ravens, american_football.game_passing_statistics.team, m.07vr6dj
m.07920ft, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.passing, m.07920zt
Baltimore Ravens, american_football.game_receiving_statistics.team, m.07921fw
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.0792j8g
Baltimore Ravens, american_football.game_passing_statistics.team, m.07z2j0t
m.0901mlp, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07921bx
Baltimore Ravens, american_football.game_passing_statistics.team, m.088wzh0
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxr
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.0792898
m.07922ps, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_s
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.0792g7h
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.0792112
Baltimore Ravens, american_football.game_passing_statistics.team, m.09rlsb2
m.088wzlf, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.09rdldz
Baltimore Ravens, american_football.game_passing_statistics.team, m.07920tq
m.079214c, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922z9
Baltimore Ravens, american_football.game_passing_statistics.team, m.08nlcgv
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.passing, m.0792135
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.rushing, m.079287r
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.07921v3
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.rushing, m.079210b
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921ws
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921k6
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.079211f
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.passing, m.0793cc_
m.07923hg, american_football.game_passing_statistics.player, Joe Flacco
m.07921j3, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.passing, m.07920nz
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288k
m.07921gw, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.079218t
m.07p5wzx, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.09g396m
m.07922mc, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921w0
Baltimore Ravens, american_football.game_passing_statistics.team, m.0792135
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.0792jbl
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.receiving, m.0792bg6
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792884
m.07z2j0t, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.0901mfp
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07921ng
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928b1
Baltimore Ravens, american_football.game_passing_statistics.team, m.07mljkv
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07922hn
m.07923cx, american_football.game_rushing_statistics.player, Joe Flacco
m.079233s, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.079210b
m.079210b, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.079211s
m.09rdldz, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.0792j7g
Baltimore Ravens, american_football.game_rushing_statistics.team, m.09rdlg2
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.passing, m.0791q2d
m.07920wq, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07922d9
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07p5x00
Baltimore Ravens, american_football.game_rushing_statistics.team, m.088wzlf
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079289p
m.07921fw, american_football.game_receiving_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.0901mlp
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0792207
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07mljn3
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g15
Baltimore Ravens, american_football.game_passing_statistics.team, m.0792061
m.09tc5rl, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fxc
Baltimore Ravens, american_football.game_passing_statistics.team, m.07921v3
m.07920q5, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.rushing, m.0792j5g
Oakland Raiders at Baltimore Ravens, 2008-10-26, american_football.football_game.passing, m.079218t
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ckm
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.passing, m.0792d47
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.079286v
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cdl
Baltimore Ravens, american_football.game_rushing_statistics.team, m.09k0f58
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921jw
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922yx
m.07921ng, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.0793cff
Baltimore Ravens, american_football.game_passing_statistics.team, m.07p5wzx
m.079222k, american_football.game_rushing_statistics.player, Joe Flacco
m.07923j8, american_football.game_rushing_statistics.player, Joe Flacco
m.07922d9, american_football.game_passing_statistics.player, Joe Flacco
Pittsburgh Steelers at Baltimore Ravens, 2008-12-14, american_football.football_game.passing, m.07922mc
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.07925gq
m.09g396m, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.rushing, m.0792j6q
Baltimore Ravens, american_football.game_rushing_statistics.team, m.09rlsc6
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07923cx
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07921j3
m.088wzh0, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921m9
m.07922x8, american_football.game_rushing_statistics.player, Joe Flacco
m.079228c, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cj6
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07920wq
Baltimore Ravens at Pittsburgh Steelers, 2008-09-29, american_football.football_game.rushing, m.0792bbk
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921_4
m.07nn21q, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.09g3943
m.07jq9q_, american_football.game_passing_statistics.player, Joe Flacco
m.098jn_d, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.0792123
m.07t46r5, american_football.game_passing_statistics.player, Joe Flacco
m.05bj8xr, sports.sports_league_draft_pick.player, Joe Flacco
m.0792061, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0792303
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07920q5
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.07921gw
m.07923bk, american_football.game_passing_statistics.player, Joe Flacco
m.09g3943, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07921m9
m.079218t, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.0792219
Baltimore Ravens, american_football.game_passing_statistics.team, m.098jn_d
m.07922hn, american_football.game_rushing_statistics.player, Joe Flacco
m.07921v3, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fyl
m.07923p2, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.079228c
Baltimore Ravens, american_football.game_passing_statistics.team, m.07923p2
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.rushing, m.0792j68
m.07vr6dj, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07920nz
m.098jp0j, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cf_
Baltimore Ravens, american_football.game_passing_statistics.team, m.079233s
m.07921m9, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921l7
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.079230w
m.07p5x00, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921j3
Baltimore Ravens, american_football.game_passing_statistics.team, m.07923bk
Baltimore Ravens, american_football.game_passing_statistics.team, m.09tc5pk
m.096qbb9, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07928bn
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07nn23j
Oakland Raiders at Baltimore Ravens, 2008-10-26, american_football.football_game.passing, m.079218b
m.07920nz, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07923s1
Baltimore Ravens, american_football.game_passing_statistics.team, m.07nn21q
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07921y1
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.079288x
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07jq9t0
Jacksonville Jaguars at Baltimore Ravens, 2008-12-28, american_football.football_game.passing, m.079233s
Cleveland Browns at Baltimore Ravens, 2008-09-21, american_football.football_game.passing, m.07920ft
m.09kngbj, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.079206h
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fzj
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.passing, m.0793fwt
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922y0
m.07922vh, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.rushing, m.0792j72
Baltimore Ravens, american_football.game_passing_statistics.team, m.07920zt
m.07921bx, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07t46r5
Oakland Raiders at Baltimore Ravens, 2008-10-26, american_football.football_game.passing, m.079322k
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.079212g
m.079226w, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07920ft
m.09k0f58, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.07921hc
m.09tc5pk, american_football.game_passing_statistics.player, Joe Flacco
m.07mljn3, american_football.game_rushing_statistics.player, Joe Flacco
m.07921y1, american_football.game_rushing_statistics.player, Joe Flacco
m.0792219, american_football.game_passing_statistics.player, Joe Flacco
m.08nlcgv, american_football.game_passing_statistics.player, Joe Flacco
m.07z2j2m, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.0793fy4
Baltimore Ravens, sports.professional_sports_team.draft_picks, m.05bj8xr
Baltimore Ravens, american_football.game_passing_statistics.team, m.07921gw
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07922ps
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921y1
Philadelphia Eagles at Baltimore Ravens, 2008-11-23, american_football.football_game.passing, m.0792219
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.079231s
m.07mljkv, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.079222k
Baltimore Ravens, american_football.game_passing_statistics.team, m.09k0f44
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.rushing, m.0792877
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.passing, m.07922vh
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kk
Baltimore Ravens, american_football.game_rushing_statistics.team, m.09tc5rl
Baltimore Ravens, american_football.game_passing_statistics.team, m.09kngbj
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g09
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.rushing, m.07921hr
Jacksonville Jaguars at Baltimore Ravens, 2008-12-28, american_football.football_game.passing, m.0792336
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.079226w
m.07920tq, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.098jp0j
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793cgh
m.07jq9t0, american_football.game_rushing_statistics.player, Joe Flacco
m.07920zt, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at Houston Texans, 2008-11-09, american_football.football_game.passing, m.07921lv
m.09rdlg2, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07t46sn
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ch5
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.07921zh
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07922x8
Baltimore Ravens, american_football.game_rushing_statistics.team, m.096qbb9
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793g0t
Baltimore Ravens, american_football.game_passing_statistics.team, m.07923hg
Baltimore Ravens, american_football.game_passing_statistics.team, m.07922mc
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922wf
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922zr
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793fz1
Baltimore Ravens, american_football.game_passing_statistics.team, m.079226w
m.079206h, american_football.game_rushing_statistics.player, Joe Flacco
m.07t46sn, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_rushing_statistics.team, m.079214c
m.07920hd, american_football.game_rushing_statistics.player, Joe Flacco
m.07nn23j, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.receiving, m.079212v
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.0793ck3
m.0901mfp, american_football.game_passing_statistics.player, Joe Flacco
Quarterback, american_football.football_player.position_s, Joe Flacco
m.07923s1, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens, american_football.game_passing_statistics.team, m.07922vh
Baltimore Ravens, american_football.game_rushing_statistics.team, m.07920hd
Baltimore Ravens, american_football.game_passing_statistics.team, m.07jq9q_
Baltimore Ravens at Miami Dolphins, 2008-10-19, american_football.football_game.rushing, m.079213m
Baltimore Ravens at Indianapolis Colts, 2008-10-12, american_football.football_game.passing, m.0792j4h
m.09k0f44, american_football.game_passing_statistics.player, Joe Flacco
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.receiving, m.0793f_3
Baltimore Ravens, american_football.game_passing_statistics.team, m.096qb7h
Cleveland Browns at Baltimore Ravens, 2008-09-21, american_football.football_game.passing, m.0792728
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.rushing, m.07922x8
Jacksonville Jaguars at Baltimore Ravens, 2008-12-28, american_football.football_game.passing, m.0792pym
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922_n
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.receiving, m.07921kx
Baltimore Ravens at New York Giants, 2008-11-16, american_football.football_game.rushing, m.07921xm
m.09rlsc6, american_football.game_rushing_statistics.player, Joe Flacco
Baltimore Ravens at Cincinnati Bengals, 2008-11-30, american_football.football_game.passing, m.07925h4
Baltimore Ravens at Cleveland Browns, 2008-11-02, american_football.football_game.passing, m.079286c
Baltimore Ravens at Dallas Cowboys, 2008-12-20, american_football.football_game.receiving, m.07922_8

Answer: Joe Flacco