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.

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

Category: MUSICAL GROUPS 
Clue: This outspoken rap group led by Chuck D. took its name from a song title that ended "Number One"
public enemy

Category: FOR GOOD MEASURE 
Clue: "I have measured out my life with coffee spoons", he wrote in "The Love Song of J. Alfred Prufrock"

t.s. eliot