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


question:
Category: PHRASES OF DEATH 
Clue: Completing 2 tasks with one action is "killing 2" of these "with one stone"
answer:
birds


question:
Category: PLANETS ON EARTH 
Clue: The seas of Neptune are long gone, replaced by the prairies near its captital, Regina, in this Canadian province
answer:

saskatchewan