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: "W"HODUNNIT? 
Clue: He was the first U.S. president to be unanimously elected
[A]: george washington


[Q]: Category: CLASSIC CINEMA 
Clue: In 1915 film, "Birth of a Nation", Joseph Henabery played this president
[A]: abraham lincoln


[Q]: Category: THE BRITISH INVASION 
Clue: Called the most successful female singer in British history she had her first U.S. No. 1 hit in 1964 with “Downtown”
[A]:
petula clark