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.
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Question: Category: HERE'S TO WATER 
Clue: This city's water treatment plant, the world's largest, lies on a 61-acre peninsula that extends into Lake Michigan

Answer: chicago


Question: Category: THE WORDS OF MARTIN LUTHER KING 
Clue: This 1954 "decision...will long be stenciled on the mental sheets of succeeding generations"

Answer: brown v. board of education


Question: Category: IT'S ALL FROM THE GREEK TO ME 
Clue: From the Greek for "acid former", this gas is the most abundant element in the earth's crust

Answer:
oxygen