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: JEWELRY
Clue: An engraved gem with a design that projects from the surface, it can be carved from onyx, agate or sardonyx
answer:
a cameo

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: PROJECT RUNAWAY
Clue: Montreal's mayor said this 1976 event "can no more have a deficit than a man can have a baby"; birth weight was over $1 billion
answer:
the summer olympics