Given the question: Information: - St Martins Tower is a 140 m ( 460 ft ) office building in Perth , Western Australia . It was the tallest building in the city from its completion in 1978 for almost 10 years , until it was overtaken in height by the BankWest Tower in 1988 . The tower contains a revolving restaurant on level 33 , the last floor with windows called '' C Restaurant '' and is the only revolving restaurant in Western Australia . For years it was informally known as the AAPT Tower , and later The Amcom Building . - Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. Australia's capital is Canberra, and its largest urban area is Sydney. - A revolving restaurant or rotating restaurant is usually a tower restaurant eating space designed to rest atop a broad circular revolving platform that operates as a large turntable. The building remains stationary and the diners are carried on the revolving floor. The revolving rate varies between one and three times per hour and enables patrons to enjoy a panoramic view without leaving their seats. The slow speed only requires less than a horsepower. Such restaurants are often located on upper stories of hotels, communication towers, and skyscrapers. - The Indian Ocean is the third largest of the world's oceanic divisions, covering (approximately 20% of the water on the Earth's surface). It is bounded by Asia on the north, on the west by Africa, on the east by Australia, and on the south by the Southern Ocean or, depending on definition, by Antarctica. It is named after the country of India. The Indian Ocean is known as "Ratnkara", ""the mine of gems"" in ancient Sanskrit literature, and as "Hind Mahsgar", ""the great Indian sea"", in Hindi. - South Australia (abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories. It has a total of 1.7 million people, and its population is the most highly centralised of any state in Australia, with more than 75 percent of South Australians living in the capital, Adelaide, or its environs. Other population centres in the state are relatively small. - The Great Australian Bight is a large oceanic bight, or open bay, off the central and western portions of the southern coastline of mainland Australia. - The Northern Territory (abbreviated as NT) is a federal Australian territory in the central and central northern regions of Australia. It shares borders with Western Australia to the west (129th meridian east), South Australia to the south (26th parallel south), and Queensland to the east (138th meridian east). To the north, the territory is bordered by the Timor Sea, the Arafura Sea and the Gulf of Carpentaria. Despite its large areaover , making it the third largest Australian federal divisionit is sparsely populated. The Northern Territory's population of 244,000 (2016) makes it the least populous of Australia's eight major states and territories, having fewer than half as many people as Tasmania. - Western Australia (abbreviated as WA) is a state occupying the entire western third of Australia. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Southern Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east. Western Australia is Australia's largest state with a total land area of 2,529,875 square kilometres (976,790 sq mi), and the second-largest country subdivision in the world however, a significant part of it is sparsely populated. The state has about 2.6million inhabitants, around 11% of the national total. 92% of the population lives in the south-west corner of the state. - The Southern Ocean, also known as the Antarctic Ocean or the Austral Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60S latitude and encircling Antarctica. As such, it is regarded as the fourth-largest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian Oceans but larger than the Arctic Ocean. This ocean zone is where cold, northward flowing waters from the Antarctic mix with warmer subantarctic waters. - A tower restaurant is a restaurant located in a tower and is accessible by an elevator. - A skyscraper is a tall, continuously habitable building having multiple floors. When the term was originally used in the 1880s it described a building of 10 to 20 floors but now describes one of at least 40-50 floors. Mostly designed for office, commercial and residential uses a skyscraper can also be called a high-rise, but the term skyscraper is often used for buildings higher than . For buildings above a height of , the term "Supertall" can be used, while skyscrapers reaching beyond are classified as "Megatall". Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'st martins tower'. Choices: - area - bay - bight - building - capital - continent - country - definition - division - eight - elevator - island - ocean - part - people - population - restaurant - skyscraper - square - state - surface - territory - three - tower - tower restaurant
The answer is:
skyscraper