Information: - Liverpool, in North West England, is a major city and metropolitan borough with an estimated population of 478,580 in 2015 within the City of Liverpool. Liverpool and its surrounding areas form the fifth largest metropolitan area in the UK, with an estimated population of over 2.24 million in 2011. The local authority is Liverpool City Council, which is the most populous local government district within the metropolitan county of Merseyside and the largest within the Liverpool City Region. - The Champ de Mars is a large public greenspace in Paris, France, located in the seventh "arrondissement", between the Eiffel Tower to the northwest and the Ecole Militaire to the southeast. The park is named after the Campus Martius ("Mars Field") in Rome, a tribute to the Latin name of the Roman God of war. The name also alludes to the fact that the lawns here were formerly used as drilling and marching grounds by the French military. - A seaside resort is a resort town or resort hotel, located on the coast. Sometimes it is also an officially accredited title, that is only awarded to a town when the requirements are met (like the title "Seebad" in Germany). - Manchester is a major city and metropolitan borough in Greater Manchester, England, with a population of 514,414 . It lies within the United Kingdom's second-most populous urban area, with a population of 2.55 million. Manchester is fringed by the Cheshire Plain to the south, the Pennines to the north and east and an arc of towns with which it forms a continuous conurbation. The local authority is Manchester City Council. - Alexandre Gustave Eiffel (born Bonickhausen ; 15 December 1832 27 December 1923) was a French civil engineer and architect. A graduate of Ecole Centrale Paris, he made his name with various bridges for the French railway network, most famously the Garabit viaduct. He is best known for the world-famous Eiffel Tower, built for the 1889 Universal Exposition in Paris, and his contribution to building the Statue of Liberty in New York. After his retirement from engineering, Eiffel focused on research into meteorology and aerodynamics, and making significant contributions in both fields. - Paris (French: ) is the capital and most populous city of France. It has an area of and a population in 2013 of 2,229,621 within its administrative limits. The city is both a commune and department, and forms the centre and headquarters of the Ile-de-France, or Paris Region, which has an area of and a population in 2014 of 12,005,077, comprising 18.2 percent of the population of France. - The Irish Sea (, , , Ulster-Scots: "Airish Sea"), separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Inner Seas off the West Coast of Scotland in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man. The sea is occasionally, but rarely, referred to as the Manx Sea. - Lancashire (; archaically the County Palatine of Lancaster; abbreviated Lancs.) is a non-metropolitan ceremonial county in north west England. The county town is Lancaster although the county's administrative centre is Preston. The county has a population of 1,449,300 and an area of . People from Lancashire are known as Lancastrians. - A unitary authority is a type of local authority that has a single tier and is responsible for all local government functions within its area or performs additional functions which elsewhere in the relevant country are usually performed by national government or a higher level of sub-national government. - The Eiffel Tower is a wrought iron lattice tower on the Champ de Mars in Paris, France. It is named after the engineer Gustave Eiffel, whose company designed and built the tower. - Wrought iron is an iron alloy with a very low carbon (less than 0.08%) content in contrast to cast iron (2.1% to 4%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight) which gives it a "grain" resembling wood, that is visible when it is etched or bent to the point of failure. Wrought iron is tough, malleable, ductile, corrosion-resistant and easily welded. Before the development of effective methods of steelmaking and the availability of large quantities of steel, wrought iron was the most common form of malleable iron. A wrought product is one that has been mechnically worked by forging, extruding, rolling, hammering, etcetera, to change its form and properties. Wrought iron is a particular worked iron product that is seldom produced today as other cheaper, superior products have substituted. - France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, and from the Rhine to the Atlantic Ocean. Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans and had a total population of almost 67 million people as of January 2017. It is a unitary semi-presidential republic with the capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse and Bordeaux. - Bolton (or locally ) is a town in Greater Manchester in North West England. A former mill town, Bolton has been a production centre for textiles since Flemish weavers settled in the area in the 14th century, introducing a wool and cotton-weaving tradition. The urbanisation and development of the town largely coincided with the introduction of textile manufacture during the Industrial Revolution. Bolton was a 19th-century boomtown, and at its zenith in 1929 its 216cotton mills and 26bleaching and dyeing works made it one of the largest and most productive centres of cotton spinning in the world. The British cotton industry declined sharply after the First World War, and by the 1980s cotton manufacture had virtually ceased in Bolton. - Blackpool is a seaside resort and unitary authority area in Lancashire, England, on England's northwest coast. The town is on the Irish Sea, between the Ribble and Wyre estuaries, northwest of Preston, north of Liverpool, northwest of Bolton and northwest of Manchester. It had an estimated population of 142,065 at the 2011 Census. - A lattice tower or truss tower is a freestanding framework tower. They can be used as electricity transmission towers especially for voltages above 100 kilovolts, as a radio tower (a self-radiating tower or as a carrier for aerials) or as an observation tower. - The Blackpool Tower is a tourist attraction in Blackpool , Lancashire , England , which was opened to the public on 14 May 1894 . Inspired by the Eiffel Tower in Paris , it is 158 metres ( 518 feet ) tall and is the 103rd tallest freestanding tower in the world . The tower is a Grade I listed building . After reading the paragraphs above, we are interested in knowing the entity with which 'blackpool tower' exhibits the relationship of 'instance of'. Find the answer from the choices below. Choices: - 1 - administrative centre - alloy - architect - area - arrondissement - building - campus - capital - census - century - city - city council - coast - commune - council - country - county - county town - december - department - district - england - failure - government - hotel - industrial revolution - island - lancaster - local authority - metropolitan - metropolitan borough - military - mill - mill town - observation tower - ocean - park - point - population - product - public - republic - research - resort - sea - seaside resort - single - territory - textile - tower - town - tribute - truss - unitary authority - urban area - world war
Answer:
observation tower