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.

Example Input: Category: '60s ROCK 
Clue: In July 1967 this group's "Light My Fire" became Elektra Records' first No. 1 single
Example Output: the doors

Example Input: Category: SYNONYMS 
Clue: This book of the Bible is a synonym of departure
Example Output: exodus

Example Input: Category: POST OFFICE 
Clue: Any issued in the U.S. since 1860 are valid to use on letters
Example Output:
postage stamps