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.
Q: Category: 3 IS A MAGIC NUMBER
Clue: Pregnant women and preschoolers within 5 miles of this facility were advised to leave the area on March 30, 1979
A:
three mile island