TASK DEFINITION: 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.
PROBLEM: Category: SPACE MISSIONS
Clue: The New Horizons mission was launched to explore this planet before it was downgraded to a dwarf

SOLUTION: pluto

PROBLEM: Category: AMERICAN EXPLORERS
Clue: After being led there by a local, Hiram Bingham claimed he "discovered" this lost Incan city in Peru

SOLUTION: machu picchu

PROBLEM: Category: IT BORDERS JUST ONE OTHER COUNTRY
Clue: Denmark

SOLUTION:
germany