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.

[EX Q]: Category: ENVIRONMENTALISM 
Clue: The world's first national park was Yellowstone, opened in 1872; this country opened its first park at Banff in 1887
[EX A]: canada

[EX Q]: Category: THINGS FARMERS KNOW 
Clue: The USDA's Risk Management Agency provides this, protecting against loss due to drought, hail & falling prices
[EX A]: insurance

[EX Q]: Category: MIND YOUR MANNERS 
Clue: If a birthday child acknowledges the giver of a gift at the time he opens it, there's no need to send this
[EX A]:
thank you note