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: APPROBATION 
Clue: In 1982 Lenny Skutnick rescued a passenger on a crashed 737 from this D.C. river
potomac

Category: CAFETERIA 
Clue: It's a good day to warm up with a bowl of this thick hearty vegetable soup, from the Italian for "something served"
minestrone

Category: CONFUSE US 
Clue: Affluent means wealthy: effluent refers to waste in this state of matter

liquid