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: THE FORTUNE 500 
Clue: Despite a 57% drop in profits last year, this oil company, No. 2, is still the most profitable co. on the list
[A]: exxon mobil


[Q]: Category: U.S. BODIES OF WATER 
Clue: You'll find the Big Branch National Wildlife Refuge on the shore of this big lake in Louisiana
[A]: lake pontchartrain


[Q]: Category: HAIL TO THE CHIEF 
Clue: In 1815 he had Congress authorize fighting with Algiers
[A]:
madison