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.
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Question: Category: BROWN 
Clue: The brown type of this still has its bran, so it's more nutritious than the white or the polished type

Answer: rice


Question: Category: TO PROTECT 
Clue: This "service" is best known for protecting the president, but also investigates forgery

Answer: the secret service


Question: Category: LIFE SCIENCE 
Clue: Not Darwin, but Herbert Spencer coined this 4-word phrase that sums up natural selection

Answer:
"survival of the fittest"