london underground
lines
Table:
Name
Map colour
First operated
Type
Length
No. Sta
Current Stock
Future Stock
Trips per annum (×1000)
Avg. trips per mile (×1000)

Bakerloo line
Brown
1906
Deep Tube
23.2km 14.5 mi
25
1972 Stock
N/A
111,136
7,665

Central line
Red
1900
Deep Tube
74 .0 km 46 .0 mi
49
1992 Stock
N/A
260,916
5,672

Circle line
Yellow
1871
Sub surface
27.2km 17 .0 mi
36
C Stock S Stock
S Stock (Currently replacing C Stock)
114,609
4,716

District line
Green
1868
Sub surface
64 .0 km 40 .0 mi
60
C Stock and D78 Stock
S Stock from 2014
208,317
5,208

Hammersmith & City line
Pink
1864
Sub surface
25.5km 15.9 mi
29
C Stock S Stock
S Stock (Currently replacing C Stock)
114,609
4,716

Jubilee line
Silver
1979
Deep Tube
36.2km 22.5 mi
27
1996 Stock
N/A
213,554
9,491

Metropolitan line
Purple
1863
Sub surface
66.7km 41.5 mi
34
S Stock
N/A
66,779
1,609

Northern line
Black
1890
Deep Tube
58 .0 km 36 .0 mi
50
1995 Stock
N/A
252,310
7,009

Piccadilly line
Dark Blue
1906
Deep Tube
71 .0 km 44.3 mi
53
1973 Stock
N/A
210,169
4,744

Victoria line
Light Blue
1968
Deep Tube
21 .0 km 13.3 mi
16
2009 Stock
N/A
199,988
15,093

Waterloo & City line
Turquoise
1898
Deep Tube
2.5km 1.5 mi
2
1992 Stock
N/A
15,892
10,595

Considering the table from the Wikipedia page 'london underground' (section 'lines') on Wikipedia, determine the column type(s) that best describe the highlighted column among these candidate types: location.region, book.periodical_subject, celebrities.celebrity, cvg.cvg_publisher, broadcast.genre, finance.currency, music.musical_scale, tennis.tennis_tournament, sports.sports_position, time.recurring_event, location.capital_of_administrative_division, sports.sports_award_winner, automotive.company, tv.tv_series_episode, music.media_format, transportation.road, music.performance_role, broadcast.broadcast, soccer.fifa, chemistry.chemical_element, film.film_genre, film.writer, soccer.football_player, education.educational_degree, astronomy.asteroid, sports.sports_award_type, film.actor, film.music_contributor, military.rank, education.educational_institution, royalty.noble_person, award.award_discipline, sports.sports_league_season, sports.pro_athlete, military.military_unit, basketball.basketball_position, film.film_distributor, aviation.aircraft_owner, location.in_state, cricket.cricket_player, award.award_ceremony, meteorology.tropical_cyclone_season, cricket.cricket_team, music.group_member, architecture.structure, law.court, government.general_election, film.film_festival_focus, book.magazine, sports.sports_championship, music.musical_group, location.jp_prefecture, computer.software, award.competition, location.australian_state, people.ethnicity, tv.tv_actor, government.government_office_or_title, internet.website, meteorology.tropical_cyclone, tennis.tennis_player, metropolitan_transit.transit_stop, astronomy.constellation, computer.computer, music.producer, tv.tv_writer, soccer.football_position, soccer.football_league, tv.tv_producer, sports.multi_event_tournament, language.human_language, geography.island, education.fraternity_sorority, soccer.football_team, astronomy.astronomical_discovery, ice_hockey.hockey_position, theater.theater_actor, religion.religious_leader, broadcast.tv_station, medicine.anatomical_structure, military.armed_force, book.written_work, music.artist, computer.operating_system, american_football.football_team, exhibitions.exhibition_sponsor, award.award, olympics.olympic_event_competition, boats.ship, boats.ship_type, location.location, military.military_post, sports.professional_sports_team, education.university, music.composer, business.business_operation, baseball.baseball_team, law.legal_case, music.music_video_director, royalty.noble_title, chess.chess_player, cricket.cricket_stadium, education.athletics_brand, sports.boxer, award.hall_of_fame_inductee, government.us_president, government.election, sports.school_sports_team, medicine.drug, olympics.olympic_games, sports.tournament_event_competition, film.production_company, spaceflight.astronaut, tv.tv_director, music.record_label, government.government_agency, royalty.monarch, film.film, broadcast.radio_format, religion.religion, royalty.kingdom, soccer.football_world_cup, location.uk_statistical_location, biology.organism_classification, location.uk_constituent_country, astronomy.orbital_relationship, business.job_title, military.military_person, visual_art.visual_artist, music.album, government.governmental_body, location.us_state, fictional_universe.fictional_character, music.lyricist, music.instrument, location.citytown, sports.sports_facility, geography.mountain, sports.sports_league_draft, interests.collection_category, music.composition, book.newspaper, sports.sports_team, location.australian_local_government_area, film.producer, location.province, sports.golfer, broadcast.tv_channel, baseball.baseball_position, fictional_universe.fictional_organization, computer.software_license, location.in_district, sports.sports_championship_event, military.military_conflict, royalty.chivalric_order_member, metropolitan_transit.transit_system, media_common.media_genre, film.director, government.politician, location.us_county, business.industry, cvg.cvg_platform, cvg.cvg_developer, medicine.disease, amusement_parks.park, tv.tv_genre, basketball.basketball_team, tv.tv_personality, people.family_member, tv.tv_series_season, architecture.venue, book.author, astronomy.star_system_body, business.customer, basketball.basketball_conference, medicine.drug_ingredient, government.legislative_session, internet.website_owner, soccer.football_team_manager, business.defunct_company, american_football.football_player, soccer.football_league_season, basketball.basketball_coach, theater.play, metropolitan_transit.transit_line, biology.animal, business.product_category, basketball.basketball_player, tennis.tennis_tournament_champion, time.event, business.consumer_product, geography.river, ice_hockey.hockey_team, location.country, location.administrative_division, protected_sites.listed_site, comic_books.comic_book_character, education.school, award.award_presenting_organization, sports.sports_league, rail.locomotive_class, law.invention, film.film_character, architecture.building, business.consumer_company, medicine.medical_treatment, broadcast.artist, award.award_category, food.food, music.writer, book.periodical_publisher, cricket.cricket_bowler, architecture.architectural_structure_owner, tv.tv_program_creator, tv.tv_character, organization.organization, geography.body_of_water, tv.tv_program, ice_hockey.hockey_player, government.political_party, aviation.airport, book.book, travel.accommodation, chemistry.chemical_compound, american_football.football_conference, organization.membership_organization, location.hud_county_place, boats.ship_class, sports.sport, astronomy.celestial_object, soccer.football_award, cvg.cvg_genre, biology.organism, organization.non_profit_organization, business.brand, baseball.baseball_player, aviation.airline, government.election_campaign, automotive.model, sports.cyclist, baseball.baseball_league, book.periodical, martial_arts.martial_artist, music.genre, broadcast.radio_station, aviation.aircraft_model, award.recurring_competition, cvg.computer_videogame, tv.tv_network, medicine.muscle, amusement_parks.ride, government.u_s_congressperson, education.field_of_study, american_football.football_coach, people.person. Output just the chosen type(s) (comma-separate multiple values) inside the list of {"answer": ["ANSWER"]}.

{"answer": ["metropolitan_transit.transit_line"]}