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.

[EX Q]: Category: 19TH CENTURY FICTION 
Clue: The 1853 novel "Clotel, or The President's Daughter" alleges that this man had an affair with a slave
[EX A]: thomas jefferson

[EX Q]: Category: AUTHORS 
Clue: In January 1999 this author issued a public statement reminding the world the third millennium really begins Jan. 1, 2001
[EX A]: arthur c. clarke

[EX Q]: Category: THE BODY HUMAN 
Clue: At about 63%, there are more atoms of this element than any other in your body
[EX A]:
hydrogen