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: CUBA, SI! 
Clue: Turquino Peak, Cuba's highest, is in the chain known as this "Maestra"; California has one "Nevada"

SOLUTION: sierra

PROBLEM: Category: DRAMA 
Clue: Sula & Helena are robotesses in this Karel Capek play

SOLUTION: "r.u.r."

PROBLEM: Category: TRENDY! 
Clue: This "24-hour" activity of buying & selling stocks for short-term gain boomed in the '90s

SOLUTION:
day trading