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: COMPOSE YOURSELF! 
Clue: At his peak he composed 2 or 3 operas a year like "Lucia di Lammermoor"

SOLUTION: gaetano donizetti

PROBLEM: Category: FORBES' RICHEST PEOPLE 
Clue: Worth $53.5 billion, Carlos Slim, owner of Telmex, became the first person from this country to top the Forbes list

SOLUTION: mexico

PROBLEM: Category: LIONS 
Clue: The Barbary lion, now essentially extinct, is best known for eating early members of this group in the Coliseum

SOLUTION:
christians