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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: SABRINA'S WITCH HANDBOOK 
Clue: (Hi, I'm Melissa Joan Hart)  The traditional number of witches in this group is 13; a leader & 12 followers

SOLUTION: coven

PROBLEM: Category: DECEMBER 1st 
Clue: 1959: 12 countries including the U.S. & the U.S.S.R. sign a treaty to keep this continent a scientific preserve

SOLUTION: antarctica

PROBLEM: Category: PAST LIVES 
Clue: Women force their husbands to stop warring in this man's 411 B.C. play "Lysistrata"

SOLUTION:
aristophanes