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: the office lehendakari is filled by which election contest? 
Knowledge Triplets: Lehendakari, government.government_office_or_title.office_holders, m.0_kqrrx
Basque Government, government.governmental_body.offices_positions, Lehendakari
m.0_kqrrx, government.government_position_held.office_position_or_title, Lehendakari
Lehendakari, government.election.office, Basque parliamentary election, 1990
Basque parliamentary election, 2012, government.election.winner, Iñigo Urkullu
Lehendakari, government.government_office_or_title.jurisdiction, Spain
Basque parliamentary election, 1994, government.election.office, Lehendakari
Lehendakari, government.government_office_or_title.jurisdiction, Basque Country
Lehendakari, government.election.office, Basque parliamentary election, 1994
Lehendakari, government.election.office, Basque parliamentary election, 2001
Basque Country, location.location.events, Alonsotegi bombing
Basque parliamentary election, 1998, government.election.election_year, 1998-10-25
Lehendakari, government.election.office, Basque parliamentary election, 1986
Lehendakari, government.election.office, Basque parliamentary election, 1998
Lehendakari, government.government_office_or_title.governmental_body_if_any, Basque Government
Basque parliamentary election, 1984, government.election.election_year, 1984-02-26
Basque parliamentary election, 2005, government.election.office, Lehendakari
Basque parliamentary election, 1990, government.election.office, Lehendakari
Basque parliamentary election, 1984, government.election.office, Lehendakari
Lehendakari, government.election.office, Basque parliamentary election, 2012
Basque parliamentary election, 2009, government.election.office, Lehendakari
Basque parliamentary election, 2012, government.election.election_year, 2012-10-21
Basque parliamentary election, 2001, government.election.election_year, 2001-05-13
Basque parliamentary election, 2012, government.election.office, Lehendakari
Basque Country, government.political_district.representatives, m.0_kqrrx
Spain, government.governmental_jurisdiction.government_positions, Lehendakari
Basque parliamentary election, 1986, government.election.election_year, 1986-11-30
Basque parliamentary election, 1990, government.election.election_year, 1990-10-28
Basque parliamentary election, 2005, government.election.election_year, 2005-04-17
Basque parliamentary election, 1998, government.election.office, Lehendakari
Basque parliamentary election, 1980, government.election.election_year, 1980-03-09
m.0_kqrrx, government.government_position_held.office_holder, Iñigo Urkullu
Basque parliamentary election, 1986, government.election.office, Lehendakari
Basque Country, location.administrative_division.country, Spain
Lehendakari, government.election.office, Basque parliamentary election, 2005
Lehendakari, government.election.office, Basque parliamentary election, 1980
Basque parliamentary election, 1994, government.election.election_year, 1994-10-23
Basque Country, location.administrative_division.capital, m.0r5v9qs
Basque parliamentary election, 2009, government.election.election_year, 2009-03-01
Basque parliamentary election, 1980, government.election.office, Lehendakari
Lehendakari, government.election.office, Basque parliamentary election, 1984
Basque Country, government.governmental_jurisdiction.government_positions, Lehendakari
Lehendakari, government.election.office, Basque parliamentary election, 2009
Basque parliamentary election, 2001, government.election.office, Lehendakari
Head of government, government.government_office_category.officeholders, m.0_kqrrx

Answer: Basque parliamentary election, 2012
Basque parliamentary election, 1998
Basque parliamentary election, 1986
Basque parliamentary election, 1980
Basque parliamentary election, 1984
Basque parliamentary election, 2005
Basque parliamentary election, 2001
Basque parliamentary election, 2009
Basque parliamentary election, 1994
Basque parliamentary election, 1990