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 simplicity, answers should be in all lower cased letters.

Ex Input:
Category: SOME SCIENCE, SOME NATURE 
Clue: The Hawaiian species of this is also known as the nene

Ex Output:
a goose


Ex Input:
Category: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota

Ex Output:
the mississippi


Ex Input:
Category: STRING THEORY 201 
Clue: String theory is part of this "P" branch of physics that studies eensy little items

Ex Output:

particle