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: 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: NEW WORDS & PHRASES 
Clue: There's a questioning sound to this collective term for people born in the 1980s & '90s

SOLUTION: generation y

PROBLEM: Category: ALSO A TOOL 
Clue: "U Can't Touch This" bone, aka the malleus, just behind the eardrum

SOLUTION:
the hammer