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 home city of the FC team that won the 1937 Tschammerpokal Championship? 
Knowledge Triplets: Veltins-Arena, architecture.structure.owner, m.0ng4nql
1937 Tschammerpokal, time.event.previous_in_series, 1936 Tschammerpokal
1. FC Lokomotive Leipzig, common.topic.notable_types, Football team
FC Schalke 04, sports.sports_team.location, Gelsenkirchen
1938 Tschammerpokal, common.topic.article, m.04q21r4
1936 Tschammerpokal, sports.sports_championship_event.champion, 1. FC Lokomotive Leipzig
FC Schalke 04, sports.sports_team.championships, 1997 UEFA Cup Final
SK Rapid Wien, sports.sports_team.sport, Football
1937 Tschammerpokal, time.event.next_in_series, 1938 Tschammerpokal
1938 Tschammerpokal, common.topic.notable_types, Sports League Season
m.0ng5235, soccer.football_team_management_tenure.team, FC Schalke 04
SK Rapid Wien, sports.sports_team.championships, 1938 Tschammerpokal
1937 Tschammerpokal, sports.sports_championship_event.champion, FC Schalke 04
FC Schalke 04, soccer.football_team.manager, m.0k22gj3
1936 Tschammerpokal, time.event.previous_in_series, 1935 Tschammerpokal
FC Schalke 04, common.topic.subjects, http://voetbalshirtsdirect.nl
FC Schalke 04, soccer.football_team.manager, m.0ng5235
FC Schalke 04, sports.sports_team.league, m.0131hgzy
1937 Tschammerpokal, common.topic.article, m.04q9nhl
m.0ndt0vv, soccer.football_league_participation.team, FC Schalke 04
FC Schalke 04, soccer.football_team.manager, m.0pc6c5g
m.0131hgzy, sports.sports_league_participation.team, FC Schalke 04
m.01205t27, soccer.football_team_management_tenure.team, FC Schalke 04
m.0rq3xhw, sports.sports_team_coach_tenure.team, FC Schalke 04
m.0gwrmyn, location.mailing_address.citytown, Gelsenkirchen
FC Schalke 04, soccer.football_team.league, m.0ndt0vv
FC Schalke 04, base.schemastaging.organization_extra.contact_webpages, m.010bfh72
FC Schalke 04, common.topic.notable_types, Football team
FC Schalke 04, base.schemastaging.organization_extra.phone_number, m.010q58w7
m.0fs6g_b, common.webpage.topic, FC Schalke 04
FC Schalke 04, soccer.football_team.manager, m.01205t27
FC Schalke 04, organization.organization.headquarters, m.0gwrmyn
m.0ngf1p6, sports.sports_team_coach_tenure.team, FC Schalke 04
m.0b6rvnz, common.webpage.topic, FC Schalke 04
1937 Tschammerpokal, sports.sports_team.championships, FC Schalke 04
Veltins-Arena, sports.sports_facility.home_venue_for, m.0wz1_v9
FC Schalke 04, sports.sports_team.championships, 1937 Tschammerpokal
FC Schalke 04, common.topic.notable_for, g.125btfrrx
m.01205t2j, base.schemastaging.sports_team_manager_tenure.team, FC Schalke 04
FC Schalke 04, soccer.football_team.manager, m.0nczmkq
Gelsenkirchen, sports.sports_team_location.teams, FC Schalke 04
FC Schalke 04, sports.sports_team.league, m.0crtmtp
FC Schalke 04, common.topic.article, m.024_qx
m.0wz1_v9, sports.team_venue_relationship.venue, Veltins-Arena
Veltins-Arena, sports.sports_facility.teams, FC Schalke 04
FC Schalke 04, base.schemastaging.sports_team_extra.season_rankings, m.010hf3vl
FC Schalke 04, sports.sports_team.colors, White
FC Schalke 04, sports.sports_team.arena_stadium, Veltins-Arena
Gelsenkirchen, location.location.contains, Veltins-Arena
1938 Tschammerpokal, time.event.next_in_series, 1939 Tschammerpokal
m.0wz1_v9, sports.team_venue_relationship.team, FC Schalke 04
FC Schalke 04, common.topic.webpage, m.0fs6g_b
FC Schalke 04, sports.sports_team.colors, Blue
SK Rapid Wien, sports.sports_team.colors, White
1. FC Lokomotive Leipzig, sports.sports_team.sport, Football
FC Schalke 04, sports.sports_team.sport, Football
1938 Tschammerpokal, common.topic.notable_for, g.125cql5w2
1938 Tschammerpokal, time.event.previous_in_series, 1937 Tschammerpokal
FC Schalke 04, sports.sports_team.venue, m.0wz1_v9
FC Schalke 04, sports.sports_team.location, Gelsenkirchen
FC Schalke 04, sports.sports_team.coaches, m.0ngf1p6
m.0ng4nql, architecture.ownership.structure, Veltins-Arena
Veltins-Arena, location.location.containedby, Gelsenkirchen
FC Schalke 04, organization.organization.board_members, m.0gwrm_q
SK Rapid Wien, common.topic.notable_types, Football team
FC Schalke 04, architecture.architectural_structure_owner.structures_owned, m.0ng4nql
1997 UEFA Cup Final, sports.sports_championship_event.champion, FC Schalke 04
m.0ng4nql, architecture.ownership.owner, FC Schalke 04
1938 Tschammerpokal, sports.sports_championship_event.champion, SK Rapid Wien
1936 Tschammerpokal, time.event.next_in_series, 1937 Tschammerpokal
1936 Tschammerpokal, common.topic.article, m.04q8157
http://voetbalshirtsdirect.nl, common.topic.subject_of, FC Schalke 04
1. FC Lokomotive Leipzig, sports.sports_team.championships, 1936 Tschammerpokal
m.0nczmkq, soccer.football_team_management_tenure.team, FC Schalke 04
FC Schalke 04, base.schemastaging.sports_team_extra.managers, m.01205t2j
m.0crtmtp, sports.sports_league_participation.team, FC Schalke 04
m.0pc6c5g, soccer.football_team_management_tenure.team, FC Schalke 04
m.0gwrm_q, organization.organization_board_membership.organization, FC Schalke 04
m.0k22gj3, soccer.football_team_management_tenure.team, FC Schalke 04
FC Schalke 04, sports.sports_team.coaches, m.0rq3xhw
m.010hf3vl, base.schemastaging.sports_league_season_ranking.team, FC Schalke 04
FC Schalke 04, common.topic.webpage, m.0b6rvnz

Answer: Gelsenkirchen