TASK DEFINITION: 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.
PROBLEM: Category: FICTIONAL CHARACTERS 
Clue: Lassiter is the gun-slinging hero of this Zane Grey novel & appears in its sequel "The Rainbow Trail"

SOLUTION: "riders of the purple sage"

PROBLEM: 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

SOLUTION: walgreens

PROBLEM: Category: WHAT'S "UP"? 
Clue: Theatrical term meaning to draw attention to oneself at the expense of another

SOLUTION:
to upstage