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.

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

Category: WE'VE GOT ISSUES 
Clue: Hopefully this magazine with editor-in-chief Rosemary Ellis earned its own seal of approval
good housekeeping

Category: MILITARY ACADEMIES 
Clue: Britain's Royal Military Academy is also known as this from its location

sandhurst