Question: The Eurovision Song Contest 2009 was held at a stadium originally built for which Olympics?

full_context: Document 1: Olympic Pool, Moscow: The Olympic Pool, formerly Swimming Pool of the Central Lenin Stadium is an aquatics center that is part of the Luzhniki Sports Complex in Moscow, Russia. It was opened in 1957 and renovated in 1980. The 10,500-seat venue hosted water polo events at the 1980 Summer Olympics. It also hosted events of the 1973 Summer Universiade, 12th World Festival of Youth and Students, 1986 Goodwill Games, Spartakiads of the Peoples of the USSR and others.
Document 2: Luzhniki Small Sports Arena: The Luzhniki Small Sports Arena (formerly, the Minor Arena of the Central Lenin Stadium; Russian: Малая спортивная арена Лужники ) is an 8,700-seat indoor arena that is part of the Luzhniki Sports Complex in Moscow, Russia. The Arena was built in 1956 in the USSR. It hosted volleyball competitions during the 1980 Summer Olympics. It also hosted events of the 1973 Summer Universiade, 1986 Goodwill Games, Spartakiads of the Peoples of the USSR and others. The arena was the home arena of ice hockey club Dynamo Moscow at 2000-2015.
Document 3: Olympic Stadium (Montreal): Olympic Stadium (French: "Stade olympique" ) is a multi-purpose stadium in Canada, located at Olympic Park in the Hochelaga-Maisonneuve district of Montreal. Built in the mid-1970s as the main venue for the 1976 Summer Olympics, it is nicknamed "The Big O", a reference to both its name and to the doughnut-shape of the permanent component of the stadium's roof. It is also called "The Big Owe" to reference the astronomical cost of the stadium and the 1976 Olympics as a whole.
Document 4: Junior Eurovision Song Contest 2009: The Junior Eurovision Song Contest 2009 was the seventh edition of Junior Eurovision Song Contest and took place in Kiev, Ukraine. It was scheduled for 21 November. 13 countries were confirmed by the European Broadcasting Union (EBU) to compete in the Contest. The contest was won by Ralf Mackenbach for the Netherlands with the song "Click Clack". At the age of 14, he is the oldest person to win the Junior Eurovision Song Contest in its seven-year history. He was joined by Italy's Vincenzo Cantiello who won the 2014 contest also at the age of 14. Luara Hayrapetyan achieved Armenia another second place. Ekaterina Ryabova also took second place for Russia.
Document 5: Eurovision Song Contest 2004: The Eurovision Song Contest 2004 was the 49th Eurovision Song Contest and it was held in the Abdi İpekçi Arena in Istanbul, Turkey.
Document 6: Miss Russia 2009: Miss Russia 2009, Manezh Central Exhibition Hall in Moscow on March 7, 2009. 50 contestants from all over the Russia compete for the crown. the reigning Miss World 2008, Ksenia Sukhinova of Tyumen crowned her successor Sofia Rudieva of Saint Petersburg as the brand new Miss Russia. Dayana Mendoza participated in the event.
Document 7: Bolshoy Ice Dome: The Bolshoy Ice Dome (Russian: Большой Ледовый дворец ) is a multi-purpose indoor arena located in Olympic Park, Sochi, Russia. Opened in 2012, the 12,000-seat arena was primarily constructed to host hockey competitions during the 2014 Winter Olympics. Following the Games, it became the home arena of HC Sochi, an expansion team of the KHL. The arena has also hosted concerts and other events. Prior to the Games, the arena hosted the IIHF World U18 Championships and Channel One Cup in 2013.
Document 8: Poland in the Eurovision Song Contest 2009: Poland participated in the Eurovision Song Contest 2009, as confirmed by Polish broadcaster Telewizja Polska (TVP). TVP continued to use the "Piosenka dla Europy" contest to select the Polish representative for the 2009 contest in Moscow. The 2009 edition of the contest was held on 14 February, with the winner decided by jury and televoting. The winner was Lidia Kopania with "I Don't Wanna Leave", represented Poland at the Eurovision Song Contest 2009 in May 2009.
Document 9: Eurovision Song Contest 2009: The Eurovision Song Contest 2009 was the 54th edition of the annual Eurovision Song Contest and was hosted by Russia after their win in 2008. It took place between 12 and 16 May 2009 at the Olympic Indoor Arena in Moscow, Russia.
Document 10: Olimpiyskiy National Sports Complex: The Olympic National Sports Complex (also known as Olympic Stadium; Ukrainian: Національний спортивний комплекс "Олімпійський" ) is a multi-use sports and recreation facility in Kiev, Ukraine, located on the slopes of the city's central Cherepanov Hill, Pechersk Raion. The stadium is the premier sports venue in Ukraine and the second largest in Eastern Europe after Moscow's Luzhniki Stadium. The complex beside its stadium also features several other sports facilities and is designed to host the Olympic Games (the stadium hosted some football matches at the 1980 Summer Olympics).
Document 11: 2009 MTV Europe Music Awards: The MTV Europe Music Awards 2009 took place in Berlin, Germany at the O2 World and Brandenburg Gate. The awards ceremony was presented by Katy Perry joined by British football commentators Alan Green and Mike Ingham as co-hosts. It was the fourth time that the MTV Europe Music Awards were hosted in Germany. Nominations for regional awards were announced on 1 September 2009, followed by those of the main awards on September 21, 2009. Pete Wentz was the host for the 2009 MTV Europe Music Awards webcast.
Document 12: Olympic Stadium (Moscow): Olympic Stadium, known locally as the Olimpiyskiy or Olimpiski, is a large indoor arena, located in Moscow, Russia. It was built for the 1980 Summer Olympics and, divided into two separated halls, hosted the basketball and boxing events.
Document 13: Luzhniki Stadium: Luzhniki Stadium (Russian: Стадион «Лужники» ; ] ), is a sports stadium in Moscow, Russia. Its total seating capacity is 81,000 seats, all covered (upgraded). The stadium is a part of the Luzhniki Olympic Complex, and is located in Khamovniki District of the Central Administrative Okrug of Moscow city. The name "Luzhniki" derives from the flood meadows in the bend of Moskva River where the stadium was built, translating roughly as "The Meadows". Its the biggest stadium in eastern Europe.
Document 14: Eurovision Song Contest 2005: The Eurovision Song Contest 2005 was the 50th annual Eurovision Song Contest. The contest took place at the Palace of Sports in Kiev, Ukraine, following Ruslana's win in the 2004 Contest with the song "Wild Dances". The contest consisted of two shows: the semi-final and final, which took place on 19 and 21 May 2005, respectively. The shows were hosted by Maria Efrosinina and Pavlo Shylko. Thirty-nine countries participated, including the débuts of Bulgaria and Moldova and the return of Hungary, which was last represented in 1998.
Document 15: Russia in the Eurovision Song Contest 2009: Russia participated in and hosted the Eurovision Song Contest 2009 in Moscow after winning the Eurovision Song Contest 2008 with the song "Believe" performed by Dima Bilan. The Russian entry was selected through a national final, organised by the Russian broadcaster Channel One Russia (C1R). Anastasia Prikhodko represented Russia with the song "Mamo", which scored 91 points in the final and finished in 11th place.
ground_truth: 1980 Summer Olympics