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

[EX Q]: Category: 18th CENTURY CORRESPONDENCE 
Clue: In 1776 she wrote, "Whilst you are... emancipating all nations, you insist upon retaining an absolute power over wives"
[EX A]: abigail adams

[EX Q]: Category: NUMBERS & LETTERS 
Clue: It's the world's most common number system & second-most common alphabet
[EX A]:
arabic