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.

[Q]: Category: BUSINESS & INDUSTRY 
Clue: This stagecoach company owned the Pony Express during the last few months of its existence
[A]: wells fargo


[Q]: Category: WHAT SIGN ARE YOU? 
Clue: You're a 7' tall red octagon with white letters; you tell folks to do this, & dang it, you mean it
[A]: a stop sign


[Q]: Category: 19th CENTURY AMERICA 
Clue: On February 28, the first of the Forty-Niners to arrive by ship docked at this California port city
[A]:
san francisco