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: what position does vernon davis play? 
Knowledge Triplets: m.07z2fbn, american_football.player_game_statistics.season, 2009 NFL season
m.07mmqv0, american_football.player_receiving_statistics.season, 2009 NFL season
Vernon Davis, common.topic.notable_types, American football player
m.02xgn4k, sports.sports_team_roster.team, San Francisco 49ers
m.07z2fp3, american_football.player_receiving_statistics.team, San Francisco 49ers
m.088yq1r, american_football.player_receiving_statistics.team, San Francisco 49ers
Vernon Davis, base.schemastaging.athlete_extra.salary, m.0j2k3bc
University of Maryland, College Park, location.location.containedby, United States of America
m.07ych4w, american_football.player_game_statistics.team, San Francisco 49ers
Football player, people.profession.specialization_of, Athlete
m.0hph_3_, sports.sports_team_roster.player, Vernon Davis
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Hingle McCringleberry
m.07z2fbn, american_football.player_game_statistics.player, Vernon Davis
Male, common.topic.article, m.05zpq8
m.02xgn4k, freebase.valuenotation.has_no_value, To
m.04mmfr8, base.gender.personal_gender_identity.gender_identity, Male
m.09grs6b, american_football.player_receiving_statistics.player, Vernon Davis
American football player, type.type.properties, Receiving
Amyotrophic lateral sclerosis, medicine.disease.risk_factors, Male
Vernon Davis, sports.pro_athlete.sports_played_professionally, m.0c54mkk
Vernon Davis, american_football.football_player.receiving, m.098kbpz
m.096pxdb, american_football.player_game_statistics.team, San Francisco 49ers
Male, medicine.risk_factor.diseases, Non-gonococcal urethritis
m.02xgn4k, sports.sports_team_roster.player, Vernon Davis
Vernon Davis, people.person.places_lived, m.03pq4kx
m.09knbj1, american_football.player_receiving_statistics.season, 2009 NFL season
American football player, type.type.properties, Position(s)
Vernon Davis, american_football.football_player.rushing, m.0791hzz
Vernon Davis, common.topic.image, Vernon Davis sideline
University of Maryland, College Park, education.educational_institution.sports_teams, Maryland Terrapins football
Male, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Males
Pancreatic cancer, medicine.icd_9_cm_classification.parent_classification, Pancreatic cancer
Washington, D.C., location.location.containedby, Area code 202
Abdominal aortic aneurysm, medicine.disease.risk_factors, Male
Vernon Davis, people.person.place_of_birth, Washington, D.C.
Vernon Davis, american_football.football_player.games, m.098kb94
m.07tf6vs, american_football.player_game_statistics.team, San Francisco 49ers
m.0791hzz, american_football.player_rushing_statistics.player, Vernon Davis
Male, base.gender.gender_identity.people, m.04j647l
m.0hpj5tk, people.sibling_relationship.sibling, Vontae Davis
m.0gxvv0q, base.gender.personal_gender_identity.gender_identity, Male
Vernon Davis, sports.drafted_athlete.drafted, m.05bv5rr
Washington, D.C., location.location.containedby, United States, with Territories
m.09grs6b, american_football.player_receiving_statistics.season, 2009 NFL season
Male, medicine.risk_factor.diseases, Golfer's elbow
m.07tf85v, american_football.player_receiving_statistics.team, San Francisco 49ers
American football player, freebase.type_hints.included_types, Athlete
heart attack, medicine.disease.parent_disease, Cardiovascular disease
m.0791j46, american_football.player_receiving_statistics.team, San Francisco 49ers
m.07nvq_b, american_football.player_game_statistics.player, Vernon Davis
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Ozamataz Buckshank
Male, common.topic.image, male.jpg
m.07z2fp3, american_football.player_receiving_statistics.season, 2009 NFL season
m.098kbpz, american_football.player_receiving_statistics.player, Vernon Davis
m.09rmfwx, american_football.player_game_statistics.player, Vernon Davis
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Dan Smith
Vernon Davis, common.topic.article, m.0br8mb
m.08nl_b0, american_football.player_game_statistics.team, San Francisco 49ers
Male, medicine.risk_factor.diseases, Autism
m.04j647l, base.gender.personal_gender_identity.gender_identity, Male
m.0n1m235, education.education.student, Vernon Davis
m.09rmg7n, american_football.player_receiving_statistics.team, San Francisco 49ers
m.0j2kdc3, base.schemastaging.athlete_salary.athlete, Vernon Davis
Vernon Davis, american_football.football_player.games, m.09rf8ty
Vernon Davis, common.topic.notable_for, g.1255n5n4x
m.08nl_b0, american_football.player_game_statistics.player, Vernon Davis
m.09k07ch, american_football.player_game_statistics.season, 2009 NFL season
United States, with Territories, base.aareas.schema.earth.sovereign_domain.sovereign_state, United States of America
Female, common.topic.subjects, ZasPorn
United States of America, base.biblioness.bibs_topic.subsumes, United States of America
m.09rmfwx, american_football.player_game_statistics.team, San Francisco 49ers
m.09tcwsl, american_football.player_receiving_statistics.season, 2009 NFL season
United States, with Territories, location.country.first_level_divisions, United States of America
Vontae Davis, common.topic.notable_types, American football player
Jacqueline Davis, people.person.children, Vernon Davis
m.09rmfwx, american_football.player_game_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.0903_l3
m.09knb4f, american_football.player_game_statistics.team, San Francisco 49ers
Hingle McCringleberry, fictional_universe.fictional_character.occupation, American football player
m.0c54mkk, sports.pro_sports_played.sport, American football
m.08nl_pm, american_football.player_receiving_statistics.team, San Francisco 49ers
Male, base.gender.gender_identity.people, m.02zd4tr
Vernon Davis, people.person.sibling_s, m.0hpj5tk
m.0903_l3, american_football.player_game_statistics.team, San Francisco 49ers
heart attack, medicine.disease.symptoms, Ventricular tachycardia
m.07sh85d, american_football.player_receiving_statistics.team, San Francisco 49ers
Male, fictional_universe.fictional_setting.fictional_characters_born_here, Shadow Figure
American football player, type.type.expected_by, Football Player
American football, freebase.equivalent_topic.equivalent_domain, American football
Vernon Davis on field pregame at Eagles at 49ers 10-12-08 1, common.image.size, m.04xz_jb
Vernon Davis, sports.pro_athlete.teams, m.0hph_3_
Vernon Davis, american_football.football_player.games, m.07sh7xd
m.09k07r4, american_football.player_receiving_statistics.player, Vernon Davis
m.09knb4f, american_football.player_game_statistics.player, Vernon Davis
m.07sh85d, american_football.player_receiving_statistics.player, Vernon Davis
m.09k07r4, american_football.player_receiving_statistics.team, San Francisco 49ers
American football player, type.type.properties, Rushing
m.07vzscn, american_football.player_receiving_statistics.player, Vernon Davis
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Rooster
Vernon Davis, people.person.education, m.03gkp1m
Vernon Davis, american_football.football_player.receiving, m.09k07r4
Male, medicine.risk_factor.diseases, Myocardial Ischemia
m.07vzs1m, american_football.player_game_statistics.season, 2009 NFL season
m.07nvq_b, american_football.player_game_statistics.season, 2008 NFL season
Male, base.gender.gender_identity.people, m.0gxvt_4
Stroke, medicine.risk_factor.diseases, Abdominal aortic aneurysm
m.02zd4tr, base.gender.personal_gender_identity.gender_identity, Male
American football player, freebase.type_profile.strict_included_types, Topic
m.0n1m235, education.education.institution, Dunbar High School
Athlete, people.profession.specializations, American football player
Vernon Davis, american_football.football_player.receiving, m.0791j46
Washington, D.C., location.administrative_division.country, United States of America
American football player, type.type.properties, Football Almanac ID
Vernon Davis, american_football.football_player.receiving, m.07mmqv0
m.09grrvc, american_football.player_game_statistics.season, 2009 NFL season
Male, base.gender.gender_identity.people, m.04j64q8
Vernondavis, common.image.appears_in_topic_gallery, Sam Hollenbach
m.08nl_pm, american_football.player_receiving_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.09knb4f
Athlete, freebase.type_hints.included_types, Person
Vernon Davis, common.topic.image, Vernondavis
m.05bv5rr, sports.sports_league_draft_pick.draft, 2006 NFL draft
m.07vzs1m, american_football.player_game_statistics.player, Vernon Davis
United States of America, location.country.capital, Washington, D.C.
m.09rf8ty, american_football.player_game_statistics.season, 2009 NFL season
American football player, fictional_universe.character_occupation.characters_with_this_occupation, D'Glester Hardunkichud
Duke Davis, people.person.children, Vernon Davis
m.09tcwdt, american_football.player_game_statistics.player, Vernon Davis
m.09tcwdt, american_football.player_game_statistics.season, 2009 NFL season
American football player, type.type.properties, Passing
Parkinson's disease, medicine.icd_9_cm_classification.parent_classification, Parkinson's disease
Male, medicine.risk_factor.diseases, Urolithiasis
American football player, type.type.properties, 40-yard dash time
Abdominal aortic aneurysm, medicine.disease.parent_disease, Cardiovascular disease
m.07n73w_, base.gender.personal_gender_identity.gender_identity, Male
m.09rf8ty, american_football.player_game_statistics.player, Vernon Davis
Vernon Davis, american_football.football_player.games, m.07z2fbn
American football player, people.profession.specialization_of, Football player
Male, medicine.risk_factor.diseases, Cardiovascular disease
m.09grs6b, american_football.player_receiving_statistics.team, San Francisco 49ers
Male, medicine.risk_factor.diseases, Burn
Jacqueline Davis, people.person.children, Vontae Davis
Vernon Davis, people.person.parents, Jacqueline Davis
Vernon Davis, american_football.football_player.receiving, m.09rf960
m.0791j46, american_football.player_receiving_statistics.season, 2008 NFL season
Male, sports.sports_gender.sports_teams, Vive Targi Kielce
Male, base.schemastaging.context_name.pronunciation, m.011sf4j6
Duke Davis, common.topic.notable_for, g.125bbyty5
American football player, freebase.type_profile.published, Published
Vernon Davis, american_football.football_player.receiving, m.07ychhq
m.04j64rh, base.gender.personal_gender_identity.gender_identity, Male
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Orin Incandenza
Vernon Davis, american_football.football_player.receiving, m.07vzscn
Male, base.gender.gender_identity.people, m.04mmfr8
m.07ych4w, american_football.player_game_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.receiving, m.09knbj1
University of Maryland, College Park, education.educational_institution.campuses, University of Maryland, College Park
Vernon Davis, common.topic.image, Vernon Davis on field pregame at Eagles at 49ers 10-12-08 1
m.07sh85d, american_football.player_receiving_statistics.season, 2009 NFL season
Duke Davis, people.person.gender, Male
m.0hph_3_, freebase.valuenotation.has_value, Number
m.09grrvc, american_football.player_game_statistics.team, San Francisco 49ers
m.03pq4kx, people.place_lived.person, Vernon Davis
American football player, type.type.properties, databaseFootball.com ID
m.088ypbh, american_football.player_game_statistics.team, San Francisco 49ers
San Francisco 49ers, sports.sports_team.sport, American football
m.09rf960, american_football.player_receiving_statistics.season, 2009 NFL season
Person, freebase.type_hints.included_types, Topic
m.0903_l3, american_football.player_game_statistics.season, 2009 NFL season
Washington, D.C., base.aareas.schema.administrative_area.administrative_parent, United States of America
m.07tf85v, american_football.player_receiving_statistics.player, Vernon Davis
Vernon Davis, american_football.football_player.games, m.09k07ch
American football player, type.type.expected_by, Player
Vernon Davis, base.schemastaging.athlete_extra.salary, m.0j2kdc3
Vernon Davis, people.person.parents, Duke Davis
Maryland Terrapins football, sports.school_sports_team.school, University of Maryland, College Park
m.07sh7xd, american_football.player_game_statistics.player, Vernon Davis
m.09k07ch, american_football.player_game_statistics.team, San Francisco 49ers
Athlete, people.profession.corresponding_type, Athlete
2006 NFL draft, sports.sports_league_draft.picks, m.05bv5rr
American football player, freebase.type_profile.strict_included_types, Person
Tight end, common.topic.article, m.02g_85
Vontae Davis, people.person.nationality, United States of America
m.07vzs1m, american_football.player_game_statistics.team, San Francisco 49ers
m.096py4q, american_football.player_receiving_statistics.player, Vernon Davis
American football player, type.type.expected_by, Football Players
m.07ych4w, american_football.player_game_statistics.player, Vernon Davis
m.07ychhq, american_football.player_receiving_statistics.player, Vernon Davis
m.098kb94, american_football.player_game_statistics.season, 2009 NFL season
Washington, D.C., location.administrative_division.first_level_division_of, United States of America
Vernon Davis, american_football.football_player.games, m.07vzs1m
Vernon Davis, american_football.football_player.games, m.07nvq_b
Male, medicine.risk_factor.diseases, Retroperitoneal fibrosis
m.02xgn4k, sports.sports_team_roster.position, Tight end
American football player, common.topic.notable_types, Profession
m.09rf960, american_football.player_receiving_statistics.player, Vernon Davis
Vernon Davis, american_football.football_player.receiving, m.07tf85v
m.05bv5rr, sports.sports_league_draft_pick.school, University of Maryland, College Park
m.088ypbh, american_football.player_game_statistics.player, Vernon Davis
Football player, common.topic.notable_types, Profession
Male, award.award_discipline.awards_in_this_discipline, SFX Award for Best Actor
m.088ypbh, american_football.player_game_statistics.season, 2009 NFL season
Athlete, common.topic.notable_types, Profession
Vernon Davis, american_football.football_player.games, m.096pxdb
American football player, type.type.expected_by, Position players selected previously
Male, base.gender.gender_identity.people, m.04j64rh
m.0gxvv0h, base.gender.personal_gender_identity.gender_identity, Male
SFX Award for Best Actor, award.award_category.disciplines_or_subjects, Male
Football player, people.profession.specializations, American football player
m.0d522bn, biology.hybrid_parentage.parent_sex, Male
Person, freebase.type_profile.strict_included_types, Topic
American football player, freebase.type_profile.strict_included_types, Athlete
m.07ychhq, american_football.player_receiving_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.07tf6vs
American football player, freebase.type_hints.included_types, Topic
Vernon Davis, sports.pro_athlete.teams, m.02xgn4k
m.096py4q, american_football.player_receiving_statistics.season, 2009 NFL season
Athlete, freebase.type_profile.equivalent_topic, Athlete
Vernon Davis, american_football.football_player.receiving, m.088yq1r
Male, medicine.risk_factor.diseases, Antisocial personality disorder
Male, medicine.risk_factor.diseases, Ventricular tachycardia
American football player, people.profession.specialization_of, Athlete
m.0j2k3bc, base.schemastaging.athlete_salary.athlete, Vernon Davis
Vernon Davis, american_football.football_player.receiving, m.09grs6b
American football player, freebase.type_hints.included_types, Person
Vernon Davis, american_football.football_player.receiving, m.09tcwsl
Abdominal aortic aneurysm, medicine.disease.risk_factors, heart attack
American football player, type.type.properties, footballdb ID
m.09knbj1, american_football.player_receiving_statistics.player, Vernon Davis
Male, medicine.risk_factor.diseases, Club foot
m.09tcwsl, american_football.player_receiving_statistics.team, San Francisco 49ers
American football player, fictional_universe.character_occupation.characters_with_this_occupation, Zook
Vernon Davis, american_football.football_player.receiving, m.07sh85d
m.0j2k3bc, base.schemastaging.athlete_salary.team, San Francisco 49ers
m.07mmqv0, american_football.player_receiving_statistics.team, San Francisco 49ers
Male, common.topic.notable_types, Risk Factor
Vernon Davis sideline, common.image.appears_in_topic_gallery, Vernon Davis
Tight end, common.topic.notable_for, g.125773y8_
American football player, common.topic.article, m.01z0fd_
Vernon Davis, american_football.football_player.games, m.07ych4w
m.098kbpz, american_football.player_receiving_statistics.team, San Francisco 49ers
Tight end, common.topic.notable_types, Sports position
Vontae Davis, people.person.place_of_birth, Washington, D.C.
m.098kb94, american_football.player_game_statistics.team, San Francisco 49ers
m.096pxdb, american_football.player_game_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.08nl_b0
Male, medicine.risk_factor.diseases, Amyotrophic lateral sclerosis
heart attack, medicine.risk_factor.diseases, Abdominal aortic aneurysm
Vernondavis, common.image.size, m.02g52zk
m.09rmg7n, american_football.player_receiving_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.088ypbh
m.07mmqv0, american_football.player_receiving_statistics.player, Vernon Davis
Vernon Davis on field pregame at Eagles at 49ers 10-12-08 1, common.image.appears_in_topic_gallery, Vernon Davis
m.0j2k3bc, base.schemastaging.athlete_salary.currency, United States Dollar
Parkinson's disease, medicine.icd_9_cm_classification.includes_classifications, Parkinson's disease
Phone Trick, biology.organism.sex, Male
m.09040tc, american_football.player_receiving_statistics.player, Vernon Davis
Phone Trick, base.thoroughbredracing.thoroughbred_racehorse.country, United States of America
Vernon Davis sideline, common.image.size, m.09hrs5t
m.03gkp1m, education.education.institution, University of Maryland, College Park
m.09grrvc, american_football.player_game_statistics.player, Vernon Davis
Vontae Davis, people.person.parents, Jacqueline Davis
Vernon Davis, american_football.football_player.receiving, m.08nl_pm
m.096py4q, american_football.player_receiving_statistics.team, San Francisco 49ers
Male, base.gender.gender_identity.people, m.09td39b
m.096pxdb, american_football.player_game_statistics.player, Vernon Davis
Male, base.gender.gender_identity.people, m.0gxvv0q
m.05bv5rr, sports.sports_league_draft_pick.player, Vernon Davis
m.09rf960, american_football.player_receiving_statistics.team, San Francisco 49ers
m.07tf85v, american_football.player_receiving_statistics.season, 2009 NFL season
American football player, type.type.expected_by, Injured by
University of Maryland, College Park, education.educational_institution_campus.educational_institution, University of Maryland, College Park
Abdominal aortic aneurysm, medicine.disease.risk_factors, Transient ischemic attack
m.07ychhq, american_football.player_receiving_statistics.team, San Francisco 49ers
Athlete, freebase.type_hints.included_types, Topic
American football player, people.profession.corresponding_type, American football player
Vernon Davis, american_football.football_player.receiving, m.07z2fp3
m.088yq1r, american_football.player_receiving_statistics.player, Vernon Davis
American football player, common.topic.notable_for, g.125by37yy
m.07z2fbn, american_football.player_game_statistics.team, San Francisco 49ers
m.0j2kdc3, base.schemastaging.athlete_salary.currency, United States Dollar
m.08nl_pm, american_football.player_receiving_statistics.player, Vernon Davis
Athlete, people.profession.specializations, Football player
m.08nl_b0, american_football.player_game_statistics.season, 2009 NFL season
Male, medicine.risk_factor.diseases, Athlete's foot
Vernon Davis, american_football.football_player.forty_yard_dash_time, m.0hpj5n9
m.098kbpz, american_football.player_receiving_statistics.season, 2009 NFL season
American football player, type.type.domain, American football
Vernon Davis, people.person.profession, American football player
Tight end, common.topic.image, Ein Tight End in der I-Formation
m.09040tc, american_football.player_receiving_statistics.season, 2009 NFL season
m.09td39b, base.gender.personal_gender_identity.gender_identity, Male
Male, medicine.risk_factor.diseases, Transient ischemic attack
Maryland Terrapins football, sports.sports_team.sport, American football
m.0791j46, american_football.player_receiving_statistics.player, Vernon Davis
m.07tf6vs, american_football.player_game_statistics.player, Vernon Davis
Vernon Davis, people.person.gender, Male
Vernon Davis, people.person.nationality, United States of America
Tight end, sports.sports_position.sport, American football
Phone Trick, base.thoroughbredracing.thoroughbred_racehorse.sex, Male
m.0c54mkk, sports.pro_sports_played.athlete, Vernon Davis
American football player, common.topic.image, football.jpg
Male, common.topic.notable_for, g.1255p_jgc
m.0791hzz, american_football.player_rushing_statistics.team, San Francisco 49ers
m.07z2fp3, american_football.player_receiving_statistics.player, Vernon Davis
m.0hph_3_, sports.sports_team_roster.team, Maryland Terrapins football
m.09k07r4, american_football.player_receiving_statistics.season, 2009 NFL season
Vernon Davis, american_football.football_player.games, m.09grrvc
American football player, type.type.expected_by, Players
Washington, D.C., location.location.containedby, United States of America
Athlete, freebase.equivalent_topic.equivalent_type, Athlete
American football, sports.sport.positions, Tight end
m.0791hzz, american_football.player_rushing_statistics.season, 2008 NFL season
m.09rmg7n, american_football.player_receiving_statistics.player, Vernon Davis
m.03gkp1m, education.education.student, Vernon Davis
Vernon Davis, american_football.football_player.receiving, m.09040tc
Vernondavis, common.image.appears_in_topic_gallery, Vernon Davis
Vernon Davis, american_football.football_player.position_s, Tight end
m.098kb94, american_football.player_game_statistics.player, Vernon Davis
m.0d521lm, biology.hybrid_parentage.parent_sex, Male
United States of America, base.biblioness.bibs_topic.is_really, United States of America
Hingle McCringleberry, fictional_universe.fictional_character.gender, Male
m.0gxvt_4, base.gender.personal_gender_identity.gender_identity, Male
Jacqueline Davis, people.person.gender, Female
m.09tcwdt, american_football.player_game_statistics.team, San Francisco 49ers
m.09tcwsl, american_football.player_receiving_statistics.player, Vernon Davis
Vernon Davis, american_football.football_player.receiving, m.096py4q
m.09040tc, american_football.player_receiving_statistics.team, San Francisco 49ers
Athlete, freebase.type_profile.strict_included_types, Person
m.02_98hd, base.gender.personal_gender_identity.gender_identity, Male
m.07sh7xd, american_football.player_game_statistics.team, San Francisco 49ers
Vontae Davis, people.person.sibling_s, m.0hpj5tk
m.07vzscn, american_football.player_receiving_statistics.team, San Francisco 49ers
Vernon Davis, american_football.football_player.games, m.09tcwdt
American football player, freebase.type_profile.kind, Title
m.0hph_3_, sports.sports_team_roster.position, Tight end
Male, medicine.risk_factor.diseases, Attention deficit hyperactivity disorder
Jacqueline Davis, common.topic.notable_types, Person
m.0j2kdc3, base.schemastaging.athlete_salary.team, San Francisco 49ers
Vernon Davis, american_football.football_player.position_s, Tight end
m.088yq1r, american_football.player_receiving_statistics.season, 2009 NFL season
Male, common.topic.subjects, ZasPorn
Male, medicine.risk_factor.diseases, Abdominal aortic aneurysm
Jacqueline Davis, common.topic.notable_for, g.125cb_j82
m.02_1x1x, base.gender.personal_gender_identity.gender_identity, Male
m.09rf8ty, american_football.player_game_statistics.team, San Francisco 49ers
Vernon Davis, american_football.football_player.receiving, m.09rmg7n
Vontae Davis, people.person.gender, Male
Duke Davis, common.topic.notable_types, Person
m.09knbj1, american_football.player_receiving_statistics.team, San Francisco 49ers
Person, freebase.type_profile.published, Published
Male, base.gender.gender_identity.people, m.0gxvv0h
m.0hpj5tk, people.sibling_relationship.sibling, Vernon Davis
m.07tf6vs, american_football.player_game_statistics.season, 2009 NFL season
m.09knb4f, american_football.player_game_statistics.season, 2009 NFL season
Vontae Davis, people.person.profession, American football player
Male, medicine.risk_factor.diseases, heart attack
American football player, type.type.properties, Games
m.07nvq_b, american_football.player_game_statistics.team, San Francisco 49ers
American football player, fictional_universe.character_occupation.characters_with_this_occupation, A. A. Ron Balakay
American football player, freebase.type_profile.equivalent_topic, American football player
American football player, freebase.documented_object.documentation, m.01z0fd_
m.05bv5rr, sports.sports_league_draft_pick.team, San Francisco 49ers
Stroke, medicine.disease.parent_disease, Cardiovascular disease
Vernon Davis, american_football.football_player.games, m.09rmfwx
San Francisco 49ers, sports.professional_sports_team.draft_picks, m.05bv5rr
Cardiovascular disease, medicine.disease.parent_disease, Cardiovascular disease
m.09k07ch, american_football.player_game_statistics.player, Vernon Davis
Vernon Davis, people.person.education, m.0n1m235
Athlete, freebase.type_profile.published, Published
American football player, freebase.equivalent_topic.equivalent_type, American football player
m.07vzscn, american_football.player_receiving_statistics.season, 2009 NFL season
m.07sh7xd, american_football.player_game_statistics.season, 2009 NFL season
Male, medicine.risk_factor.diseases, Stuttering
m.0903_l3, american_football.player_game_statistics.player, Vernon Davis
Abdominal aortic aneurysm, medicine.disease.risk_factors, Stroke
United States of America, location.location.containedby, United States, with Territories
m.04j64q8, base.gender.personal_gender_identity.gender_identity, Male
Male, medicine.risk_factor.diseases, Stroke
Stroke, medicine.disease.risk_factors, Transient ischemic attack
Athlete, freebase.type_profile.strict_included_types, Topic

Answer: Tight end