Given the question: Information: - Kai Tak Airport was the international airport of Hong Kong from 1925 until 1998. It was officially known as Hong Kong International Airport from 1954 to 6 July 1998, when it was closed and replaced by the new Hong Kong International Airport at Chek Lap Kok, to the west. It is often known as Hong Kong International Airport, Kai Tak, or simply Kai Tak, to distinguish it from its successor which is often referred to as Chek Lap Kok Airport. - The West Rail Line is one of the MTR lines in Hong Kong, indicated by the colour dark magenta. It was formerly known as the KCR West Rail. The line connects Hung Hom Station in Kowloon and Tuen Mun Station in Tuen Mun, 35.7km away, in 37 minutes. The railway runs through the cities of Kowloon, Castle Peak and Tsuen Wan. - Hong Kong International Airport is the main airport in Hong Kong. It is located on the island of Chek Lap Kok, which largely comprises land reclaimed for the construction of the airport itself. The airport is also colloquially known as Chek Lap Kok Airport (), to distinguish it from its predecessor, the closed Kai Tak Airport. - Hong Kong, officially the Hong Kong Special Administrative Region of the People's Republic of China, is an autonomous territory on the Pearl River Delta of East Asia. Macau lies across the delta to the west, and the Chinese province of Guangdong borders the territory to the north. With a total land area of and a population of over 7.3 million of various nationalities, it ranks as the world's fourth most densely populated sovereign state or territory. - The East West Corridor is a Hong Kong MTR railway link that is part of the Sha Tin to Central Link project. As with the other parts of the Shatin-Central Link, it has been approved by the Executive Council of Hong Kong. It will link up the West Rail Line and Ma On Shan Line through the Shatin-Central Link (Hung Hom to Tai Wai section). Before the rail merger, services on the operational sections of the line were provided by the KCRC. Completion of the line is expected for 2019. - Kai Tak Station is an under construction railway station on the East West Corridor of the Shatin to Central Link . It is named after the former Kai Tak Airport . The station is located in the Kai Tak Development Area near the old east apron of the old Kai Tak Airport , and will provide access to the multi-purpose stadium and other facilities . Prior to this , the closest stations to the old Kai Tak airport were the Diamond Hill , Wong Tai Sin and Lok Fu stations . The station has two levels : a concourse level above a lower level with an island platform . A topping - out ceremony was held on 16 July 2015 to mark completion of major civil works . It is the second Shatin to Central Link station to top out , after Hin Keng Station . - The Executive Council of Hong Kong (Chinese name before the transfer of sovereignty: ) is a formal body of advisers to the Chief Executive of Hong Kong that serves as a core policy-making organ of the Government of Hong Kong. It is analogous to a cabinet or to other executive councils in the Commonwealth such as the Federal Executive Council of Australia, the Executive Council of New Zealand, and the Privy Council of the United Kingdom. - The Ma On ShanLine is a branch line of the MTR East RailLine in Hong Kong. It is coloured brown on the MTR map. Before 2 December 2007, the railway was operated by the Kowloon-Canton Railway Corporation (KCRC) as Ma On Shan Rail (abbreviated as ). Since the KCRC's merger of operations with the MTR Corporation, the line has been one of the ten lines of the MTR. - Chek Lap Kok is an island in the western waters of Hong Kong. Together with the smaller Lam Chau, it was leveled and merged via land reclamation into the island for the current Hong Kong International Airport, which opened for commercial aviation in 1998. The airport is therefore popularly referred to as "Chek Lap Kok Airport". - The Mass Transit Railway (MTR) is the rapid transit railway system of Hong Kong. Opened in 1979, the system now includes of rail with 161 stations, including 93 railway stations and 68 light rail stops. Operated by the MTR Corporation Limited (MTRCL), the MTR is one of the most profitable metro systems in the world, with a high farebox recovery ratio of 186%. - The Sha Tin to Central Link (abbreviated SCL) is an under-construction expansion of the MTR rapid transit network in Hong Kong. Its route is divided into two sections. Given the information above, choose from the list below the object entity that exhibits the relation 'part of' with the subject 'kai tak station'. Choices: - airport - asia - body - central link - china - chinese - chinese name - commercial aviation - government - july - ma - map - mass - mtr - name - population - river - station - system
The answer is:
mtr