Question: Which south eastern suburb in Adelaide, South Australia provided the bricks to build the Old Government House in Belair National Park?
Context: Eden Hills is a south eastern suburb located in the foothills of Adelaide, South Australia.  It is part of the local government area of the City of Mitcham. The South Eastern Freeway (previously signposted as Princes Highway) is a 76 kilometre controlled-access highway in South Australia.  It carries traffic over the Adelaide Hills between Adelaide and the River Murray, near Murray Bridge, connecting via the Swanport Bridge to the Dukes Highway which is the main road route to Victoria.  It is often referred to by South Australians simply as "the Freeway", as it was the first freeway in South Australia, and is still the longest, and the only one with "Freeway" in its name rather than "Expressway" or "Highway".  It is a part of the National Highway network linking the state capital cities Adelaide to Melbourne and signed as National Highway M1.  The South Eastern Freeway includes 500-metre-long twin-tube tunnels (the Heysen Tunnels) in the descent towards Adelaide, the first of their kind on the National Highway.  It is designated as the M1. Long Gully railway station was located in the Belair National Park, South Australia.  The original plan was for the siding to be named Minnow.  The layout of the passing siding is unusual as, being on an "S" in the main line, traffic in both directions defaulted to the sharper left side while crossing the points to enter the yard.  This anomaly was removed when the line was converted to standard gauge in 1995 and the passing siding was replaced by a single line. The Old Government House, located in Pietermaritzburg, was the official residence of the Lieutenant-Governor of Natal, Sir Benjamin Pine, who arrived in Natal in 1851.  The building was completed in the late 1860s and the Natal Government later bought it from Pine and established it as Government House. National Park railway station was a railway station in South Australia located on the Adelaide-Wolseley line in the suburb of Belair and within the boundaries of the Belair National Park. Belair National Park (formerly known as the National Park and as Belair Recreation Park) is a protected area located at Belair in South Australia (Australia), 13 km south of Adelaide city centre and which covers an area of 835 ha .  It was proclaimed in 1891 and was the first national park in South Australia, second in Australia (after Sydney's Royal National Park which was proclaimed in 1879) and the tenth in the world.  The national park lies within the Adelaide Hills and Mitcham council area, and forms part of a chain of protected areas located along the Adelaide Hills Face Zone.  The national park is administered by the Department of Environment, Water and Natural Resources. Blackwood is a south eastern suburb located in the foothills of Adelaide, South Australia.  It is part of the local government area of the City of Mitcham. The Old Government House is a former "country" residence used by ten early governors of New South Wales between 1800 and 1847, located in Parramatta Park in Parramatta, New South Wales, now a suburb of Sydney.  It is considered a property of national and international significance as an archaeological resource.  It also serves to demonstrate how the British Empire expanded and Australian society has evolved since 1788. Old Government House was the former official residence and home of the Governor of Tasmania from 1807 to 1858, when it was demolished following completion of the modern Government House, Hobart on the Queens Domain.  It was located approximately where Hobart Town Hall and Franklin Square stand now.It was built sometime between 1805 and 1810 with dates varying according to sources and at least during 1831 housed the Tasmanian Parliament as well as being the residence of the Governor and meeting place of the Tasmanian Society, a precursor to the Royal Society of Tasmania.  The Tasmanian Parliament moved to the modern Parliament House, Hobart in 1841, and following the construction of the modern Government House the old house was demolished.  It had earlier been reserved for the location of the new Town hall and a Franklin monument, which were both later built there and continue to stand to this day. Old Government House is an historic building located in Belair National Park, South Australia, and was South Australia’s first official vice-regal summer residence of the Governor of South Australia from 1860-1880, and was used by governors Richard Graves MacDonnell (1855–62), Dominick Daly (1862-68) and William Jervois (1877–80).  It was constructed from local sandstone, with the red-brick for the quoins sourced from the Blackwood brickworks, and a native timber shingle roof.  The residence's indoor plunge-pool was reportedly the first in the colony.
Answer: Blackwood