Please answer the following question: Information: - The Nantucket Harbor Range Lights are range lights which were built in 1908 to guide vessels through the narrow channel to Nantucket Harbor. They replaced an older arrangement involving the Nantucket Beacon and the Brant Point Light which became unusable when thelaer was replaced with a new tower. - The Nantucket Beacon formed a range with the Brant Point Light to guide vessels into Nantucket harbor . Operated at various times in the 19th century , it was deactivated sometime after 1870 . This range was eventually succeeded by the Nantucket Harbor Range Lights , which are still in operation . - The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation. A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred preserving the property. - 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. - Brant Point Light is a lighthouse located on Nantucket Island. The station was established in 1746, automated in 1965, and is still in operation. The current tower was added to the National Register of Historic Places on October 28, 1987; it has the distinction of being the tenth light on the point, in addition to several range lights. Four of the others burned or blew down, two were condemned, two were unsatisfactory, and the remaining one stands unused. 'nantucket beacon' is related to which object entity through the relation of 'instance of'? Choices: - addition - building - century - channel - district - federal government - government - harbor - island - lighthouse - list - october - operation - point - property - range - sea - tower
A:
lighthouse