In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

[Q]: The Iran nuclear deal framework was a preliminary framework agreement reached in 2015 between the Islamic Republic of Iran and a group of world powers: the P5 + 1 (the permanent members of the United Nations Security Council -- the United States, the United Kingdom, Russia, France, and China -- plus Germany) and the European Union.
[A]: what is the deal we made with iran


[Q]: According to the United Kingdom Border Agency, a person who is not a British citizen, a Commonwealth citizen with the right of abode in the UK, or a national of an EU or EFTA state, requires leave to enter the United Kingdom.
[A]: when does a person need leave to enter the uk


[Q]: The Tower of London, officially Her Majesty's Royal Palace and Fortress of the Tower of London, is a historic castle located on the north bank of the River Thames in central London. It lies within the London Borough of Tower Hamlets, separated from the eastern edge of the square mile of the City of London by the open space known as Tower Hill. It was founded towards the end of 1066 as part of the Norman Conquest of England. The White Tower, which gives the entire castle its name, was built by William the Conqueror in 1078 and was a resented symbol of oppression, inflicted upon London by the new ruling elite. The castle was used as a prison from 1100 (Ranulf Flambard) until 1952 (Kray twins), although that was not its primary purpose. A grand palace early in its history, it served as a royal residence. As a whole, the Tower is a complex of several buildings set within two concentric rings of defensive walls and a moat. There were several phases of expansion, mainly under Kings Richard I, Henry III, and Edward I in the 12th and 13th centuries. The general layout established by the late 13th century remains despite later activity on the site.
[A]:
what type of castle was the tower of london