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: RIVERS 
Clue: The mouth of this 2315-mile-long river lies in the Mississippi River 17 miles above St. Louis

Ex Output:
the missouri


Ex Input:
Category: THE ELEMENTS 
Clue: Most fluorescent lights are filled with a combination of argon & this element, Kr

Ex Output:
krypton


Ex Input:
Category: LORD 
Clue: During WWI future Lord Louis of Battenberg's family name was changed to this less Teutonic one

Ex Output:

mountbatten