Information:  - Marcel Reinier Wouda (born 23 January 1972, Tilburg) is a former Dutch swimmer, who became the first Dutch world champion in men's swimming when he won the world title in the 200 m individual medley at the 1998 World Aquatics Championships in Perth, Australia. He was the coach of Olympic champions Maarten van der Weijden and Hinkelien Schreuder at the Nationaal Zweminstituut Eindhoven.  - 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.  - Hinkelien Schreuder (born 13 February 1984) is a butterfly, freestyle and backstroke swimmer from The Netherlands, who also competed in the medley events. She's currently living in Eindhoven, where she is studying physiotherapy, and is training at the same club as multiple Olympic champion Pieter van den Hoogenband where she is currently training under the guidance of former world champion Marcel Wouda. Schreuder won the Olympic gold medal in the 4×100 freestyle relay at the 2008 Olympics in Beijing, and a bronze in the same event at the 2012 Summer Olympics. She is a former world record holder in the 100 m individual medley, and former European record holder in the 50 m butterfly short course.  - Job Kienhuis ( born November 7 , 1989 ) is a Dutch swimmer who mainly specializes in the middle - and long freestyle events . He is currently training under the guidance of former world champion Marcel Wouda alongside olympic champion Hinkelien Schreuder . He owns three national records , two in long course 800 m and 1500 m freestyle . In short course he has one national record , 1500 m freestyle .  - FINA or "Fédération internationale de natation" (English: "International Swimming Federation") is the international federation recognized by the International Olympic Committee (IOC) for administering international competition in water sports. It is one of several international federations which administer a given sport/discipline for the IOC and/or international community. It is based in Lausanne, Switzerland.  - In swimming, the term short course (abbreviated SC) is used to identify a pool that is in length. The term is also often included in meet names when conducted in a short course pool. "Short course" is the second type of pool configuration currently recognized by FINA and other swimming bodies for pool competition; the other/primary pool length being "long course", where the pool is 50 meters in length. Olympic and the World Aquatics Championships are conducted in a long course pool.    After reading the paragraphs above, we are interested in knowing the entity with which 'job kienhuis' exhibits the relationship of 'participant of'. Find the answer from the choices below.  Choices: - 2012 summer olympics  - sport
2012 summer olympics