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.

Category: WORLD LEADERS 
Clue: Unopposed, he was elected to his 5th term as president in 1998; he's been in power since 1959
fidel castro

Category: SCIENTISTS 
Clue: In 1543 he wrote, "Finally we shall place the sun himself at the center of the universe"
nicolaus copernicus

Category: FICTIONAL CHARACTERS 
Clue: This character, created in Europe in the 19th c., has a name that can be translated as "eye of pine"

pinocchio