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.

Category: READ THE FOOD LABEL 
Clue: The daily values are based on a diet of 2,000 or 2,500 of these a day
calories

Category: NONFICTION 
Clue: This minister's "The Purpose-Driven Life" was the top nonfiction bestseller of both 2003 & 2004
rick warren

Category: FASHION STATEMENTS 
Clue: You take these "off" to praise someone, but keep something "under" one to keep a secret

a hat