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 consistency, answers should be in all lower cased letters.

[Q]: Category: "Y"? 
Clue: You can split the atom or even do barrel rolls using this toy
[A]: a yo-yo


[Q]: Category: ECONOMICS 
Clue: After deducting all expenses from your gross profit, you're left with this
[A]: net


[Q]: Category: AROUND THE USA 
Clue: This Calif. city's Transamerica Pyramid stands on the site of the Exchange Saloon where Mark Twain once imbibed
[A]:
san francisco