instruction:
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.
question:
Category: THE FORTUNE 500
Clue: Despite a 57% drop in profits last year, this oil company, No. 2, is still the most profitable co. on the list
answer:
exxon mobil

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: "C" WORLD
Clue: Rich deposits of copper have been found on this Mediterranean island whose name means "copper"
answer:
cyprus