Question: What is the name of the league that celebrated its 87th season, in which Club Deportivo Leganés participated in?
Context: Club Deportivo Euzkadi was an association football team that played in the Primera Fuerza league in Mexico during the 1938–39 season.  It was formed when the Basque Country national football team, which had been touring the world, was refused permission by the world governing body of association football FIFA, to play any more FIFA affiliated teams due to political issues arising from the ongoing Spanish Civil War.  As a result of this ruling the team decided to stay in Mexico and participate in the Mexican domestic league under the name Club Deportivo Euzkadi, a move which FIFA allowed. Club Deportivo Leganés, S.A.D. is a Spanish football team from Leganés, in the Madrid outskirts.  Founded on 26 June 1928 it currently plays in the Primera División, holding home games at "Estadio Municipal de Butarque", which seats 11,454 spectators. Club Deportivo Leganés B is a Spanish football team from Leganés, in the Madrid outskirts.  They are the reserve team of CD Leganés.  They play in white shirts with blue stripes, and white shorts.  Their home stadium is the Anexo de Butarque. The 2003 Major League Soccer All-Star Game was the 8th Major League Soccer All-Star Game, played on August 2, 2003 at The Home Depot Center, now known as StubHub Center, in Carson, California.  The All-Star Game celebrated both the opening of the league's second soccer-specific stadium that season, as well as the announcement of the league's expansion with an eleventh team purchased by the owners of Mexico's Club Deportivo Guadalajara.  Then-MetroStars head coach Bob Bradley was tapped to lead the MLS All-Stars against Guadalajara, commonly known as Chivas, and led by their head coach, Eduardo de la Torre. During the 2017–18 season, Club Deportivo Leganés are participating in La Liga for the second time in their history, and the Copa del Rey. The 2017–18 La Liga season, also known as La Liga Santander for sponsorship reasons, is the 87th since its establishment.  The season began on 18 August 2017 and is scheduled to conclude on 20 May 2018.  The fixtures of the 2017–18 season were released on 21 July 2017. The 2015–16 Manchester City season was the club's 114th season of competitive football, its 87th season in the top division of English football and its 19th season in the Premier League since the League creation, with Manchester City as one of the original 22 founder-members.  Along with the Premier League, the club also competed in the UEFA Champions League, FA Cup and League Cup.  The season covers the period from 1 July 2015 to 30 June 2016. The 1986–87 FC Bayern Munich season was the 87th season in the club's history and 22nd season since promotion from Regionalliga Süd in 1965.  Bayern Munich won its 9th Bundesliga title.  This title marked a third consecutive championship for the club.  The club reached the third round of the DFB-Pokal and finished as runner-up of the European Cup.  The Bundesliga campaign ended with only one loss with no away losses.  This feat set two Bundesliga records that were not repeated until the 2012–13 season.  This season was the final season under manager Udo Lattek. The 2016–17 season was Ergotelis' 87th season in existence and 1st season in the Gamma Ethniki, the third tier of the Greek football league system, after 14 years in which the club competed in professional competitions.  Ergotelis also participated in the Gamma Ethniki Cup, a football competition cup in which only the clubs competing in one of the four groups of the Gamma Ethniki can participate.  The season marked the beginning of a new era in the club's history, as the previous Football Club opened winding-up proceedings entering into liquidation, a process that allowed the parent sport club G.S. Ergotelis to form a new football department eligible to compete in the Gamma Ethniki under new leadership, free of the financial obligations of the previous administration.  The club slogan for the season "Ksekiname!"  (Greek: Ξεκινάμε! )  literally translates to "We begin!" .  The project was successful, as Ergotelis finished as Champions of Group 4, achieving instant promotion to the Football League, and professional divisions in general. Club Deportivo Universidad San Marcos was a Peruvian football club based in Lima, Peru.  The club was part of the National University of San Marcos and its last participation in a football league was in the 2011 Peruvian Segunda División.  They first started competing in the 2001 season.  Previously, the team had won five editions of the National Sporting University Games ("Juegos Deportivos Universitarios Nacionales").  Their 2006 season in the second division was the most notable as they fought Deportivo Municipal for promotion to the Primera División but they finished second and were not promoted.  Universidad San Marcos played its home games at the university's Estadio Universidad San Marcos, located in the center of the National University of San Marcos' main campus in Lima.  Due to financial difficulties in 2011, the club withdrew from the second division and folded in 2012 and the Peruvian Football Federation subsequently gave the club a 10-year ban from all competition.
Answer: 2017–18 La Liga