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.

Q: Category: A PARIS CHRONOLOGY 
Clue: Paris was founded around 250 B.C. by the Celtic Parisii tribe, who built a settlement on an island in this river

A: the seine
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Q: Category: A LITTLE OF THE BUBBLY 
Clue: Roy Allen opened root beer stands in 1922 & introduced this brand name for his product

A: a&w
****
Q: Category: SAM HE IS 
Clue: He served as speaker of the U.S. House of Representatives for 17 years, the longest term ever

A:
sam rayburn
****