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.
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Question: Category: ENVIRONMENTALISM 
Clue: The world's first national park was Yellowstone, opened in 1872; this country opened its first park at Banff in 1887

Answer: canada


Question: Category: MYTHS & LEGENDS 
Clue: The name of this creature comes from the old English for "man-wolf"

Answer: werewolf


Question: Category: ECONOMICS 
Clue: After deducting all expenses from your gross profit, you're left with this

Answer:
net