Answer the following question: Information: - Cape Cod Bay is a large bay of the Atlantic Ocean adjacent to the U.S. state of Massachusetts. Measuring below a line drawn from Brant Rock in Marshfield to Race Point in Provincetown, Massachusetts, it is enclosed by Cape Cod to the south and east, and Plymouth County, Massachusetts, to the west. To the north of Cape Cod Bay lie Massachusetts Bay and the Atlantic Ocean. Cape Cod Bay is the southernmost extremity of the Gulf of Maine. Cape Cod Bay is one of the bays adjacent to Massachusetts that give it the name Bay State. The others are Narragansett Bay, Buzzards Bay, and Massachusetts Bay. - Billingsgate Island, also sometimes known as Bellingsgate Island, was an island off Cape Cod in Massachusetts in the United States. Originally settled as a fishing and whaling community as part of the town of Eastham, Massachusetts, Billingsgate Island was for a long time the site of a lighthouse used as a navigational aid in Cape Cod Bay. It is sometimes known by local historians as the Atlantis of Cape Cod. - Eastham is a town in Barnstable County, Massachusetts, United States, Barnstable County being coextensive with Cape Cod. The population was 4,956 at the 2010 census. - Atlantis ("island of Atlas") is a fictional island mentioned within an allegory on the hubris of nations in Plato's works "Timaeus" and "Critias", where it represents the antagonist naval power that besieges "Ancient Athens", the pseudo-historic embodiment of Plato's ideal state (see "The Republic"). In the story, Athens repels the Atlantean attack unlike any other nation of the (western) known world, supposedly giving testament to the superiority of Plato's concept of a state. At the end of the story, Atlantis eventually falls out of favor with the gods and submerges into the Atlantic Ocean. - Wellfleet is a town in Barnstable County, Massachusetts, United States, and is located halfway between the "tip" and "elbow" of Cape Cod. The town had a population of 2,750 at the 2010 census, which swells nearly sixfold during the summer. A total of 70% of the town's land area is in protection, and nearly half of it is part of the Cape Cod National Seashore. Wellfleet is famous for its eponymous oysters, which are celebrated in the annual October Wellfleet OysterFest. - Cape Cod is a geographic cape extending into the Atlantic Ocean from the southeastern corner of mainland Massachusetts, in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. - Billingsgate Island Light was located on what is still called Billingsgate Island though it is underwater at high tide , at the entrance to the harbor in Wellfleet , Massachusetts . - Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all, oysters are in the superfamily Ostreoidea. - Massachusetts ; officially the Commonwealth of Massachusetts, is the most populous state in the New England region of the northeastern United States. It is bordered by the Atlantic Ocean to the east, the states of Connecticut and Rhode Island to the south, New Hampshire and Vermont to the north, and New York to the west. The state is named for the Massachusett tribe, which once inhabited the area. The capital of Massachusetts and the most populous city in New England is Boston. Over 80% of Massachusetts' population lives in the Greater Boston metropolitan area, a region influential upon American history, academia, and industry. Originally dependent on agriculture, fishing and trade, Massachusetts was transformed into a manufacturing center during the Industrial Revolution. During the 20th century, Massachusetts' economy shifted from manufacturing to services. Modern Massachusetts is a global leader in biotechnology, engineering, higher education, finance, and maritime trade. - The Cape Cod National Seashore (CCNS), created on August 7, 1961 by President John F. Kennedy, encompasses on Cape Cod, in Massachusetts. It includes ponds, woods and beachfront of the Atlantic coastal pine barrens ecoregion. The CCNS includes nearly of seashore along the Atlantic-facing eastern shore of Cape Cod, in the towns of Provincetown, Truro, Wellfleet, Eastham, Orleans and Chatham. It is administered by the National Park Service. - A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses, and to serve as a navigational aid for maritime pilots at sea or on inland waterways. Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'billingsgate island light'. Choices: - agriculture - allegory - atlas - august - bay - cape - census - century - common name - ecoregion - education - engineering - england - fictional island - gulf - industry - island - lighthouse - line - manufacturing - metropolitan area - name - navigational aid - number - ocean - part - point - population - region - republic - revolution - sea - service - shape - state - time - tourism - town - water
Answer:
lighthouse