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

Category: SALAD DRESSING 
Clue: This national-named dressing often made with ketchup is found in deli sandwiches
russian dressing

Category: STATE FLAGS 
Clue: This state's first official "Lone Star" flag was a naval flag it adopted in 1836 while still a republic

texas