You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

[Q]: Category: QUEEN ELIZABETH II 
Clue: It's Queen Elizabeth's official London residence
[A]: buckingham palace


[Q]: Category: BEHIND THE SCENES AT THE 2008 OLYMPICS 
Clue: A journalist for ITN was detained & manhandled for covering a "pro-" this region protest held early in the Olympics
[A]: tibet


[Q]: Category: THE CIVIL WAR 
Clue: This national battlefield in Sharpsburg, Md. commemorates the bloodiest single day of the Civil War
[A]:
antietam