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 : Subiaco Oval ( ; currently known under naming rights as Domain Stadium, and colloquially as Subi) is a football stadium located in Subiaco, a suburb of Perth, Western Australia. The highest capacity stadium in Western Australia and one of the main stadiums in Australia, seating 43,500 people, the ground is the home of Australian rules football in Western Australia, being the home ground for the West Coast Eagles and Fremantle Football Club, the two Western Australian teams in the Australian Football League (AFL). The ground is also used for occasional West Australian Football League (WAFL) matches, including the competition's yearly grand final. The stadium has also hosted Perth Glory games, including two National Soccer League grand finals, international rules matches, rugby union games and rock concerts. It was the home ground for the Western Force between 2006 and 2009. Context_2 : Christian Brothers College, informally known as CBC Perth or The Terrace was an Independent school for boys situated on St Georges Terrace in the centre of Perth, Western Australia. The college opened in January 1894, and the college was a founding member of the Public Schools Association in 1905. The college was the second high school (1894) and the second boarding school (1896) in Western Australia. In 1938 boarders and some day students at CBC moved to the new Aquinas College campus at Salter Point. Brother C.P. Foley, who was the headmaster of CBC Perth and who at the same was the first headmaster of Aquinas took with him the Christian Brothers College crest and colours, honour boards, and Public Schools Association membership. Brother Foley insisted the heritage of CBC Perth from 1894-1937 belonged to Aquinas. To further enhance Aquinas as the premier the Christian Brothers College, the main building at Aquinas was designed in the Federation Arts and Crafts architecture of CBC Perth. Meanwhile, although most of the day students remained at CBC Perth, numbers were depleted and the college immediately accepted an overflow of students from St Patrick's Boys School on Wellington Street. CBC Perth continued as a day school from 1938-1961. In 1962, the students and staff of CBC Perth moved to a new site on the East Perth foreshore and the college was renamed Trinity College. Context_3 : Graham Vivian "Polly" Farmer, MBE (born 10 March 1935) is a retired Australian rules football player and coach. Born in Western Australia, he joined the East Perth Football Club as a ruckman in 1953, where he won several awards and contributed to the team winning three premierships. He was recruited to the Victorian Football League (VFL) league in 1962 for the Geelong Football Club, where he played 101 games and captained the team for three seasons. Farmer returned to Western Australia and became the captain/coach of the West Perth Football Club in 1968, leading the club to premierships against East Perth in 1969 and 1971. After retiring as a player, he coached Geelong, East Perth and Western Australia's first state of origin team. Context_4 : The Perth Cultural Centre is an area of central Perth, Western Australia, centred on the James Street Mall. It is home to a number of cultural institutions including the Art Gallery of Western Australia, Western Australian Museum, State Library of Western Australia, State Records Office, State Theatre Centre of Western Australia, and Perth Institute of Contemporary Arts (PICA). Context_5 : The WACA (formally the WACA Ground) is a sports stadium in Perth, Western Australia. The stadium's name derives from the initials of its owners and operators, the Western Australian Cricket Association. Context_6 : The ComBat was an aluminium cricket bat and the subject of an incident that occurred at the WACA cricket ground in Perth in December 1979. Context_7 : Perth Oval (also known as nib Stadium under a naming rights agreement with nib Health Funds) is a sports stadium in Perth, the capital of the Australian state of Western Australia. Located close to Perth's central business district, the stadium currently has a maximum capacity of 20,500 people for sporting events and 25,000 people for concerts, with the ground's record attendance of 32,000 people set during an Ed Sheeran concert in 2015. The land on which the stadium was built was made a public reserve in 1904, with the main ground developed several years later. Context_8 : Domenick Louis "Don" Marinko (27 August 1907 4 May 1967) was an Australian rules footballer who played for the Subiaco and West Perth Football Clubs in the Western Australian National Football League (WANFL) and the Boulder City Football Club in the Goldfields Football League (GFL). Born in the Goldfields region of Western Australia, he was educated at Christian Brothers' College in Perth, and made his senior debut for Subiaco in 1923, at the age of 16. The following season, Marinko returned to the Goldfields in order to find work in the mines, and took up playing for the Boulder City Football Club in the Goldfields Football Association (GFA), playing in premierships in 1924 and 1925. Returning to Perth, he fell into West Perth's zone, and began playing with the club in 1926. Marinko played in premiership sides for West Perth in 1932, 1934, and 1935, and was captain of the club for the latter two seasons. At his retirement in 1939, he had played 194 games for the club, and 197 games total in the WAFL, as well as playing thirteen interstate matches for Western Australia. Having died in 1967 from a sudden heart attack, Marinko was named in West Perth's Team of the Century in 2000, and inducted into the West Australian Football Hall of Fame in 2011. Context_9 : Wayne Douglas Hill (born 5 December 1953) is a former Australian cricketer who played several matches as a wicket-keeper for Western Australia, and later served in a number of positions with the Western Australian Cricket Association (WACA). From Perth, Hill made his first-class debut for Western Australia during the 198384 Sheffield Shield, playing four matches during the competition when Rod Marsh was unavailable due to selection for the national team. He scored 31 not out in Western Australia's first innings, in what was to be his highest first-class score. Marsh retired at the end of the season, and Hill played in Western Australia's first three Sheffield Shield matches, as well as a tour match against the West Indies and a match in the limited-overs McDonald's Cup. However, he was subsequently replaced by Tim Zoehrer as wicket-keeper in both competitions, and did not play at state level again. Hill continued to play at grade cricket level for the Perth Cricket Club, retiring after the 198788 season with 162 matches and a club-record 323 dismissals (264 catches and 59 stumpings). From 1995, he served on the selection panel for Western Australia, and was appointed chairman of selectors in April 2002. Hill retired from the panel at the conclusion of the 200607 season, and was replaced by Tom Hogan as chairman. Context_10 : The Western Australian Athletics Stadium is a sports stadium in Perth, Western Australia. It is the main facility for the sport of athletics in Perth. It was constructed to replace the ageing Perry Lakes Stadium nearby, which had been in use since the 1962 British Empire and Commonwealth Games. The stadium houses the head offices of Athletics Western Australia and is a major facility for athletes with the Western Australian Institute of Sport. The stadium is also used for soccer, with Subiaco AFC playing home games at the stadium from 2014. fact_1 : The ComBat was an aluminium cricket bat and the subject of an incident that occurred at the WACA cricket ground in Perth in December 1979. fact_2 : The WACA (formally the WACA Ground) is a sports stadium in Perth, Western Australia. Answer: ComBat
What was the subject of an incident at a sports stadium in Perth, Western Australia?