TASK DEFINITION: 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.
PROBLEM: Category: WE GET LETTERS 
Clue: This cable television network uses an exclamation point in its name

SOLUTION: e!

PROBLEM: Category: U.S. HISTORY 
Clue: The Cajuns migrated to Louisiana from there

SOLUTION: nova scotia

PROBLEM: Category: VAMPIRE SLAYERS 
Clue: "The Watcher's Guide" & "The Sunnydale High Yearbook" are offical book companions to this TV show

SOLUTION:
buffy the vampire slayer