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.

Example Input: Category: LITERARY SEQUELS 
Clue: "The Restaurant at the End of the Universe" was one of Douglas Adams' sequels to this novel
Example Output: the hitchhiker\'s guide to the galaxy

Example Input: Category: A BUSINESS IS BORN 
Clue: The first drug-store in this chain began operating out of a Chicago hotel in 1901; in 2009 the 7,000th store opened
Example Output: walgreens

Example Input: Category: THE ROMAN EMPIRE 
Clue: Tiberius was almost killed by a falling rock while dining in Spelunca, a decorated one of these
Example Output:
a cave