instruction:
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.
question:
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
answer:
antarctica


question:
Category: "D"-VIDE 
Clue: In the book of Revelation, he rides the pale horse
answer:
death


question:
Category: THE LIBRARY 
Clue: On most reference books in your local library, you'll find this letter above the call number
answer:

r