You will be given a definition of a task first, then some input of the task.
In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Context_1 : Belize competed in the 2008 Summer Olympics, held in Beijing, People's Republic of China from 8 to 24 August 2008. Its participation in Beijing marked its eighth Olympic appearance under the name "Belize" and its tenth overall, as its first two appearances (1968 in Mexico City and 1972 in Munich) were under the name "British Honduras". The Belizean delegation in 2008 included four athletes: three participated in track and field events (Jonathan Williams, Tricia Flores, and Jayson Jones) and one in taekwondo (Alfonso Martinez). Belize did not medal in Beijing, and had not medaled before Beijing, but Jonathan Williams became the first Belizean athlete to advance past the first round of any Olympic event. Context_2 : Marcel Haentjens (24 June 1869 - 10 June 1915) was a French croquet player and equestrian. He competed at the 1900 Summer Olympics in both croquet and equestrian. In croquet he competed in both the one ball singles and the two ball singles and did not finish in either. In equestrian he did not finish in either the high jump or the mixed jumping. His final event was the hacks and hunter combined. He finished 4th in this event which is not considered an official Olympic event by the International Olympic Committee. Context_3 : Frederick Carlton "Carl" Lewis (born July 1, 1961) is an American former track and field athlete who won nine Olympic gold medals, one Olympic silver medal, and 10 World Championships medals, including eight gold. His career spanned from 1979 to 1996 when he last won an Olympic event and subsequently retired. He is one of only three Olympic athletes who won a gold medal in the same event in four consecutive Olympic Games. Context_4 : Shannon McCurley (born (1992--)26 1992 ) is an Australian born Irish female track cyclist. She won the bronze medal in the under-23 scratch event at the 2011 European Track Championships (under-23 & junior). She is based in Melbourne and trains there and with the Irish track cycling team in Majorca, being coached by Brian Nugent. She competed in the scratch event at the 2012 UCI Track Cycling World Championships. She switched to the Olympic event of keirin racing in 2014 in order to attempt qualification for the 2016 Summer Olympics in Rio de Janeiro. She was successful in clinching an Olympic place, becoming the first Irish female to qualify for an Olympic track cycling event. Context_5 : The Summer Olympic Games (French: "Jeux olympiques d'ete" ) or the Games of the Olympiad, first held in 1896, is an international multi-sport event that is hosted by a different city every four years. The most recent Olympics were held in Rio de Janeiro, Brazil. The International Olympic Committee organizes the games and oversees the host city's preparations. In each Olympic event, gold medals are awarded for first place, silver medals are awarded for second place, and bronze medals are awarded for third; this tradition began in 1904. The Winter Olympic Games were created due to the success of the Summer Olympics. Context_6 : Sailing/Yachting is an Olympic sport that has been part of the Olympic programme starting from the Games of the 1st Olympiad (1896 Olympics in Athens, Greece). With the exception of 1904 and possibly 1916, sailing has always been an Olympic event. The Sailing program in 2004 consisted of eleven disciplines divided over nine sailing classes. For each discipline multiple races were scheduled between 1428 August 2004 along the coast near Athens. Athens hosted the Olympic sailing competitions for the second time, having previously done so during the 1896 Summer Olympics. However, in 1896, the sailing competition was cancelled due to heavy storms and further bad weather conditions. This time the weather conditions were good. The sailing event was executed on the several types of Olympic courses in different course areas using the 'Fleetrace' and 'Matchrace' formats. Context_7 : The 2016 Summer Olympics (Portuguese: "Jogos Olimpicos de Verao de 2016" ), officially known as the Games of the XXXI Olympiad and commonly known as Rio 2016, was a major international multi-sport event celebrated in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Context_8 : Pyotr Grigoryevich Skripchenkov (Russian: ; 14 February 1926 2010) competed in the period when butterfly was being split from breaststroke as a separate swimming style, and Skripchenkov was one of the first Soviet swimmers who mastered the butterfly. In 1952, he took part in the Summer Olympics in the 200 m breaststroke, when butterfly was not an Olympic event yet. In 19531954 he swam the butterfly leg in the 4 100 m medley relay and helped the Soviet team to set three world records. Between 1949 and 1954 he won two national titles and set five national records. He later competed in the masters category, mostly in the 50 m butterfly event, in which he won the world championships in 1990 and several national titles. Context_9 : Aitor Martinez (born 22 August 1993) is a Spanish swimmer. He competed in the men's 4 100 metre freestyle relay event at the 2016 Summer Olympics. Context_10 : Biathlon at the 1960 Winter Olympics consisted of one biathlon event, held at McKinney Creek Stadium, Tahoma, California. The event occurred on 21 February 1960. This was the first appearance of modern biathlon in the Olympic Games. In 1924, a military patrol event was held. Some sources do not include this military patrol race as an Olympic event, but the IOC considers it an event within biathlon. fact_1 : Aitor Martinez (born 22 August 1993) is a Spanish swimmer. fact_2 : He competed in the men's 4 100 metre freestyle relay event at the 2016 Summer Olympics. fact_3 : The 2016 Summer Olympics (Portuguese: "Jogos Olimpicos de Verao de 2016" ), officially known as the Games of the XXXI Olympiad and commonly known as Rio 2016, was a major international multi-sport event celebrated in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Answer: Rio de Janeiro
Output:
Aitor Martinez competed in an Olympic event that was held in what city?