You will be given a definition of a task first, then some input of the task.
In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: Valentin Ivanovich Muratov (30 July 1928  6 October 2006) was a Russian gymnast and gymnastics coach. He competed at the 1952 and 1956 Olympics in all artistic gymnastics event and won four gold and one silver medal. He also won four gold medals at the 1954 world championships, sharing the all-around gold medal with Viktor Chukarin and the floor gold medal with Masao Takemoto. , Nobuyuki Aihara (   Aihara Nobuyuki , December 16 , 1934 -- July 16 , 2013 ) was a Japanese gymnast . He competed at the 1956 Olympics and won a silver medal in floor exercise and a silver medal in the team competition . Four years later he won gold medals in these events . Aihara took gymnastic at the age of 15 while studying at the Nippon Sport Science University . He was coached by his future teammate Masao Takemoto . In 1964 he married Toshiko Shirasu - Aihara , a fellow gymnast . Because of an injury he missed the Tokyo Olympics that year , and soon retired to become a gymnastics coach . In 1979 he founded the Aihara Gymnastics Club . Aihara died of pneumonia on July 16 , 2013 , at the age of 78 . He was survived by son Yutaka , also an Olympic gymnast ., At the 1952 Summer Olympics he won the silver medal in the vault with a score of 19.150, which was 0.050 short of the gold medal. Two years later he became world champion in the floor exercise, sharing the first placed with Valentin Muratov; he also won a silver medal with the Japanese team and a bronze at the parallel bars. At the 1956 Summer Olympics Takemoto won three bronze medals: in the horizontal bar, parallel bars and rings; he also received a silver medal as part of the Japanese team. His main skills were on the floor exercise and he proved it once again at the 1958 World Artistic Gymnastics Championships, where he successfully defended his title; he also won silver medals in the vault and team event, as well as a bronze medal in the horizontal bar. At the 1960 Summer Olympics Takemoto won a team gold medal and placed second in the horizontal bar., The 1952 Summer Olympics, officially known as the Games of the XV Olympiad, were an international multi-sport event held in Helsinki, Finland, in 1952. Helsinki had been earlier selected to host the 1940 Summer Olympics, which were cancelled due to World War II. It is the northernmost city at which a summer Olympic Games have been held. It was also the Olympic Games at which the most number of world records were broken until surpassed by the 2008 Summer Olympics in Beijing. The Soviet Union, the People's Republic of China, Indonesia, Israel, Thailand, and Saarland made their Olympic debuts in Helsinki 1952., The 1960 Summer Olympics, officially known as the Games of the XVII Olympiad (Italian: "Giochi della XVII Olimpiade"), was an international multi-sport event held from August 25 to September 11, 1960, in Rome, Italy. Rome had been awarded the organization of the 1908 Summer Olympics, but after the 1906 eruption of Mount Vesuvius, was forced to decline and pass the honors to London., The 1956 Summer Olympics, officially known as the Games of the XVI Olympiad, were an international multi-sport event which was held in Melbourne, Victoria, Australia, in 1956, apart from the equestrian events, which were held five months earlier in Stockholm. The 1956 Games were the first to be staged in the Southern Hemisphere and Oceania, as well as the first to be held outside Europe and North America. Melbourne is the southernmost city to host the games. Equestrian events could not be held in Australia due to quarantine regulations. This was the second Olympics not to be held entirely in one country, the first being the 1920 Summer Olympics, which Antwerp, Belgium, co-hosted with Amsterdam and Ostend., The 14th Artistic Gymnastics World Championships were held on July 610, 1958 in Moscow, the capital of the USSR., Subject: nobuyuki aihara, Relation: sport, Options: (A) artistic gymnastics (B) gymnastics (C) sport
Output:
artistic gymnastics