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: FILMS OF THE '70s 
Clue: This 1973 thriller was re-released in 2000 with extra footage, including a scene in which Ritalin is prescribed

SOLUTION: the exorcist

PROBLEM: Category: BRITISH MONARCHS 
Clue: Before Victoria & Elizabeth II, this was the last British monarch to reign during 2 different centuries

SOLUTION: george iii

PROBLEM: Category: AUTHORS 
Clue: In January 1999 this author issued a public statement reminding the world the third millennium really begins Jan. 1, 2001

SOLUTION:
arthur c. clarke