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.

Category: ALL ABOUT RIVERS 
Clue: You may be waiting for the Robert E. Lee on a natural one of these raised river banks created by flood waters
levee

Category: A CHRISTMAS CAROL 
Clue: "A partridge in a pear tree"
"the twelve days of christmas"

Category: THE SEVEN CATHOLIC SACRAMENTS 
Clue: Whether mortal or venial, you should confess them in penance

sins