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: 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: GOING ALPHANUMERIC 
Clue: Bingo square coordinate that sounds like a synonym for "not malignant"
answer:
b-9


question:
Category: THE SMITHS 
Clue: Explorer said to have been saved by Pocahontas
answer:

john smith