Information: - The Jurassic (from Jura Mountains) is a geologic period and system that spans 56.3 million years from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period Mya. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major TriassicJurassic extinction event. Two other extinction events occurred during the period: the Pliensbachian/Toarcian event in the Early Jurassic, and the Tithonian event at the end; however, neither event ranks among the "Big Five" mass extinctions. - In the geological timescale the Tithonian is the latest age of the Late Jurassic epoch or the uppermost stage of the Upper Jurassic series. It spans the time between 152.1 4 Ma and 145.0 4 Ma (million years ago). It is preceded by the Kimmeridgian and followed by the Berriasian stage (part of the Cretaceous). - The Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period million years ago (Mya) to the beginning of the Paleogene Period Mya. It is the last period of the Mesozoic Era. The Cretaceous Period is usually abbreviated K, for its German translation "Kreide" (chalk). - In the geological timescale, the Berriasian is an age or stage of the Early Cretaceous. It is the oldest, or lowest, subdivision in the entire Cretaceous. It spanned the time between 145.0 4.0 Ma and 139.8 3.0 Ma (million years ago). The Berriasian succeeds the Tithonian (part of the Jurassic) and precedes the Valanginian. - The Early Cretaceous/Middle Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 146Ma to 100 Ma. - The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous epoch or a stage in the Lower Cretaceous series. It spans the time between 132.9 2 Ma and 129.4 1.5 Ma (million years ago). The Hauterivian is preceded by the Valanginian and succeeded by the Barremian. - The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 1.5 Ma (million years ago) and 125.0 1.0 Ma). It is a subdivision of the Early Cretaceous epoch (or Lower Cretaceous series). It is preceded by the Hauterivian and followed by the Aptian stage. - In the geologic timescale , the Valanginian is an age or stage of the Early or Lower Cretaceous . It spans between 139.8 3.0 Ma and 132.9 2.0 Ma ( million years ago ) . The Valanginian stage succeeds the Berriasian stage of the Lower Cretaceous and precedes the Hauterivian stage of the Lower Cretaceous . Given the information above, choose from the list below the object entity that exhibits the relation 'subclass of' with the subject 'valanginian'. Choices: - age - chalk - cretaceous - early cretaceous - early jurassic - german - jurassic - late jurassic - name - series - stage - system - time - translation - triassic
early cretaceous

(Question)
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. Given the information above, choose from the list below the object entity that exhibits the relation 'participant of' with the subject 'efthalia koutroumanidou'. Choices: - 2004 summer olympics - 2008 summer olympics - 2012 summer olympics - sport
(Answer)
2004 summer olympics