Information: - The 2012 Summer Olympics, formally the Games of the XXX Olympiad and commonly known as London 2012, was a major international multi-sport event celebrated in the tradition of the Olympic Games, as governed by the International Olympic Committee (IOC). It took place in London and to a lesser extent across the United Kingdom from 25 July to 12 August 2012. The first event, the group stage in women's football began on 25 July at the Millennium Stadium in Cardiff, followed by the opening ceremonies on 27 July. 10,768 athletes from 204 National Olympic Committees (NOCs) participated. - Vassiliki Arvaniti (born March 17, 1985 in Athens, Greece) is a female beach volleyball player from Greece, who won the gold medal at the 2005 European Championships in Moscow, Russia and the 2007 European Championship in Valencia, Spain, partnering Vasso Karadassiou. She represented her native country at the 2004 Summer Olympics in her home town, with Thaleia Koutroumanidou. At the 2008 Summer Olympics, she competed with Karadassiou. Later, she took part in the 2012 London Olympics with Maria Tsiartsiani who was later injured. Since 2013, her teammate has been Peny Karagkouni who used to play indoor volleyball. - Maria Tsiartsiani (born 21 October 1980 in Thessaloniki) is a Greek Olympic beach volleyballer. She competed at the 2008 Summer Olympics, partnering with Efthalia Koutroumanidou. At the 2012 Summer Olympics, she competed with Vassiliki Arvaniti. - Efthalia '' Thaleia '' Koutroumanidou ( Greek : '' '' ; born 7 October 1982 in Volos ) is a Greek Olympic beach volleyballer at the 2008 Summer Olympics and the 2004 Athens Olympics . She is partnered with Maria Tsiartsiani . - Beach volleyball is a team sport played by two teams of two players on a sand court divided by a net. It has been an Olympic discipline since the 1996 Games. After reading the paragraphs above, we are interested in knowing the entity with which 'efthalia koutroumanidou' exhibits the relationship of 'participant of'. Find the answer from the choices below. Choices: - 2004 summer olympics - 2008 summer olympics - 2012 summer olympics - sport
2004 summer olympics

Information: - The City and South London Railway (C&SLR) was the first deep-level underground "tube" railway in the world, and the first major railway to use electric traction. The railway was originally intended for cable-hauled trains, but owing to the bankruptcy of the cable contractor during construction, a system of electric traction using electric locomotivesan experimental technology at the timewas chosen instead. - Liverpool, in North West England, is a major city and metropolitan borough with an estimated population of 478,580 in 2015 within the City of Liverpool. Liverpool and its surrounding areas form the fifth largest metropolitan area in the UK, with an estimated population of over 2.24 million in 2011. The local authority is Liverpool City Council, which is the most populous local government district within the metropolitan county of Merseyside and the largest within the Liverpool City Region. - Alexandra Dock was a station located on the Liverpool Overhead Railway , west of Regent Road ( A565 ) and within the MDHC Dock Estate . The station was named after the adjacent Alexandra Dock . The station was opened on the 6 March 1893 by the Marquis of Salisbury and was the northern terminus of the line until it was extended to Seaforth Sands just over a year later . The station closed , along with the rest of the line , on 30 December 1956 . No evidence of this station remains . - The Liverpool Overhead Railway (known locally as the Dockers' Umbrella) was an overhead railway in Liverpool which operated along the Liverpool Docks and opened in 1893 with lightweight electric multiple units. The railway had a number world firsts; it was the first electric elevated railway, the first to use automatic signalling & electric colour light signals, electric multiple units, and was home to one of the first passenger escalator at a railway station. It was also the second oldest electric metro in the world being preceded by the 1890 City and South London Railway. In the early 1900s electric trains ran on the electrified Lancashire and Yorkshire Railway to Southport and Aintree. Special trains to Aintree for the horse race meetings ran twice a year after regular services were withdrawn. Being a local railway it was not nationalised in 1948. - The Lancashire and Yorkshire Railway (L&YR) was a major British railway company before the 1923 Grouping. It was incorporated in 1847 from an amalgamation of several existing railways. It was the third-largest railway system based in Northern England (after the Midland and North Eastern Railways). After reading the paragraphs above, we are interested in knowing the entity with which 'alexandra dock ' exhibits the relationship of 'instance of'. Find the answer from the choices below. Choices: - borough - city - city council - company - construction - council - county - district - england - local authority - local government - number - population - railway company - railway station - railway system - station - technology - time - year
railway station