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: DOUBLE TALK 
Clue: In the 1920s Donald Duncan introduced this child's toy to America & it's had its ups & downs ever since
[A]: yo-yo


[Q]: Category: OPTICS 
Clue: On New Year's or any other day, it's the fineness of detail that can be distinguished in a photographic image
[A]: resolution


[Q]: Category: WORLD OF WARCRAFT 
Clue: The M1 Abrams type of this has been called "the backbone of the armored forces of the U.S. military"
[A]:
a tank