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 shot the politician who had been the U.S. Attorney for the Northern District of Georgia? 
Knowledge Triplets: Ardmore, location.statistical_region.population, g.11x1l1p_x
Ardmore, location.statistical_region.population, m.0hm0884
Government Office or Title, type.type.properties, Governmental body (if any)
U.S. Attorney for the Northern District of Georgia, government.government_office_or_title.office_holders, m.04kmvm1
Ardmore, location.statistical_region.population, m.0hm0898
Ardmore, location.statistical_region.population, g.11x1hg4hb
Topic, freebase.type_profile.published, Published
m.0459wjc, government.government_position_held.office_position_or_title, U.S. Attorney for the Northern District of Georgia
m.0459wjc, government.government_position_held.office_holder, Bob Barr
Carter County, location.us_county.hud_county_place, Ardmore
Government Office or Title, type.type.expected_by, Offices
m.04g55sc, user.dfhuynh.default_domain.assassination.outcome, Failure
Ardmore, location.statistical_region.population, g.11x1g6966
Larry D. Thompson, government.politician.government_positions_held, m.04kmvm1
m.0459wjc, government.government_position_held.appointed_by, Ronald Reagan
Ardmore, location.statistical_region.population, m.0hm08dy
Government Office or Title, freebase.type_profile.kind, Definition
John Hinckley Jr., people.person.education, m.05nn8w5
Ardmore, location.statistical_region.population, g.11x1h_10q
John Hinckley Jr., people.person.education, m.04hx0xv
KVSO, broadcast.broadcast.area_served, Ardmore
Ardmore, location.statistical_region.population, m.0hm088h
Government Office or Title, freebase.type_profile.strict_included_types, Non-Agent
Government Office or Title, type.type.expected_by, Title of Chief Executive
Ardmore, location.location.contains, Black Theater of Ardmore
U.S. Attorney for the Northern District of Georgia, common.topic.notable_types, Government Office or Title
U.S. Attorney for the Northern District of Georgia, government.government_office_or_title.office_holders, m.0459wjc
m.04g55sc, user.dfhuynh.default_domain.assassination.date, 1981-03-30
Carter County, location.us_county.county_seat, Ardmore
Ardmore, location.statistical_region.population, g.11x1k9dqm
Southern Oklahoma Technology Center, location.location.containedby, Ardmore
Ardmore, location.location.geolocation, m.0kg60h
Ardmore, location.statistical_region.population, m.0hm088x
Ronald Reagan, government.political_appointer.appointees, m.0459wjc
John Hinckley Jr., user.avh.default_domain.ellerdale_topic.ellerdale_id, 009a-0e58
Ardmore, location.statistical_region.population, g.11x1k66k7
Washington, D.C., location.location.events, Attempted assassination of Ronald Reagan
Ardmore, location.hud_county_place.county, Carter County
Ardmore, location.statistical_region.population, g.11x1d3qk_
m.04kmvm1, government.government_position_held.office_holder, Larry D. Thompson
Office, position, or title, owl#inverseOf, Office Holders
Government Office or Title, common.topic.article, m.02xlj1v
Ardmore, location.location.people_born_here, John Hinckley Jr.
m.0cl6z0s, film.performance.character, John Hinckley, Jr.
Ardmore, location.location.containedby, Carter County
Ardmore, location.statistical_region.population, m.0hm08hc
m.04g55sc, user.dfhuynh.default_domain.assassination.assassinated_person, Ronald Reagan
Ardmore, location.statistical_region.population, g.11x1lcvn9
Ardmore, location.statistical_region.population, m.0k6wwkl
Ardmore, location.statistical_region.population, m.0hm08b4
m.04g55sc, user.dfhuynh.default_domain.assassination.method, Gun
Ardmore, location.statistical_region.population, g.11x1mdy93
Government Office or Title, type.type.domain, Government
Ardmore, location.statistical_region.population, g.11x1ht38c
Office, position, or title, type.property.expected_type, Government Office or Title
Ardmore, location.statistical_region.population, m.0hm08df
m.05nn8w5, education.education.student, John Hinckley Jr.
Government Office or Title, type.type.expected_by, Government positions
m.04g55sc, user.dfhuynh.default_domain.assassination.assassin, John Hinckley Jr.
Ardmore, location.statistical_region.population, m.0hm08hr
Ardmore, location.statistical_region.population, m.0k6wwkt
Ardmore, location.statistical_region.population, m.0hm08fv
Ardmore, location.location.contains, Southern Oklahoma Technology Center
Ardmore, location.statistical_region.population, g.11x1cdr6g
John Hinckley Jr., fictional_universe.person_in_fiction.representations_in_fiction, John Hinckley, Jr.
Ardmore, location.statistical_region.population, m.0jt8z19
Ardmore, location.statistical_region.population, m.0hm08c5
m.0n0y9rk, education.education.student, John Hinckley Jr.
Ardmore, location.statistical_region.population, m.0hm08g6
Government Office or Title, type.type.properties, Jurisdiction
Ardmore, location.location.containedby, Oklahoma
Ardmore, location.statistical_region.population, m.0hm08g_
Ardmore, location.location.area, 134.1
Ardmore, location.statistical_region.population, g.11x1l2nz1
Government Office or Title, type.type.expected_by, Office
Government Office or Title, type.type.expected_by, Office, Position, or Title
Office, position, or title, type.property.reverse_property, Office Holders
Oklahoma, location.location.contains, Ardmore
Government Office or Title, type.type.expected_by, Office, position, or title
Government Office or Title, freebase.type_profile.strict_included_types, Topic
Black Theater of Ardmore, location.location.containedby, Ardmore
John Hinckley Jr., people.person.education, m.0n0y9rk
m.04g55sc, user.dfhuynh.default_domain.assassination.assassin, John Hinckley Jr.
m.0459wjc, government.government_position_held.appointed_by, Ronald Reagan
John Hinckley Jr., people.person.date_of_birth, 1955-05-29
Dornick Hills Country Club, location.location.containedby, Ardmore
John Hinckley Jr., nytimes.topic.uri, top$002Freference$002Ftimestopics$002Fpeople$002Fh$002Fjohn_w_jr_hinckley
Ardmore, location.statistical_region.population, g.11b66dl60t
Attempted assassination of Ronald Reagan, base.culturalevent.event.entity_involved, John Hinckley Jr.
John Hinckley, Jr., fictional_universe.fictional_character.based_on, John Hinckley Jr.
Ardmore, location.statistical_region.population, g.11x1kdmw_
John Hinckley Jr., people.person.gender, Male
m.04g55sc, user.dfhuynh.default_domain.assassination.location, Washington, D.C.
Government Office or Title, freebase.type_profile.published, Published
John Hinckley Jr., people.person.place_of_birth, Ardmore
U.S. Attorney for the Northern District of Georgia, common.topic.notable_for, g.1255nb0yy
Ardmore, location.statistical_region.population, g.11x1k6qhn
Ardmore, location.statistical_region.population, g.11x1f21zx
Ardmore, location.statistical_region.population, g.11bymhylx1
John Hinckley Jr., fictional_universe.fictional_character.gender, Male
Male, fictional_universe.character_gender.characters_of_this_gender, John Hinckley Jr.
Ronald Reagan, user.dfhuynh.default_domain.assassinated_person.assassination, m.04g55sc
Government Office or Title, freebase.type_profile.strict_included_types, Abstract
Ardmore, location.statistical_region.population, m.0hm08cl
Ardmore, location.hud_county_place.place, Ardmore
John Hinckley Jr., base.prison.prisoner.imprisoned, m.04dwnw8
Ardmore, location.statistical_region.population, g.11x1cgpt1
m.04hx0xv, education.education.student, John Hinckley Jr.
Ardmore, location.statistical_region.population, m.0hm08gm
m.04kmvm1, government.government_position_held.office_position_or_title, U.S. Attorney for the Northern District of Georgia
Ardmore, location.statistical_region.population, g.11x1cgnvy
Ardmore, location.statistical_region.population, m.0hm08d0
Government Office or Title, type.type.properties, Office Holders
Ardmore, location.statistical_region.population, g.11x1f3z55
Washington Hilton, location.location.events, Attempted assassination of Ronald Reagan
Ardmore, location.statistical_region.population, g.11x1jyyjt
Government Office or Title, type.type.expected_by, Offices/Positions Within the Body
Government Office or Title, freebase.type_hints.included_types, Topic
Ardmore, location.statistical_region.population, m.0hm089p
Ronald Reagan, user.dfhuynh.default_domain.assassinated_person.assassination, m.04g55sc
m.04dwnw8, base.prison.imprisonment.prisoner, John Hinckley Jr.
Bob Barr, government.politician.government_positions_held, m.0459wjc
Ardmore, location.statistical_region.population, m.0hm08fb
Ardmore, location.statistical_region.population, g.11x1k4d8b
Ardmore, location.statistical_region.population, g.11x1jm99c
Ardmore, location.statistical_region.population, g.12vqh_4rb
Government Office or Title, type.type.properties, Category
Ardmore, location.statistical_region.population, g.11x1lz77z
Ardmore, location.statistical_region.population, m.0hm08bt
Carter County, location.location.contains, Ardmore
Office, position, or title, rdf-schema#range, Government Office or Title
m.0ztjrhk, dataworld.gardening_hint.last_referenced_by, John Hinckley Jr.
Ardmore, location.location.contains, Dornick Hills Country Club
U.S. Attorney for the Northern District of Georgia, government.government_office_or_title.office_holders, m.0459wjc

Answer: John Hinckley Jr.