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.

Category: CORPORATE AMERICA 
Clue: Every year, this company delivers more than a billion packages, more than the Post Office
ups

Category: OPERAS BY CONTINENT 
Clue: "Aida "
africa

Category: HANNIBAL LECTURE 
Clue: To avoid being handed over to the Romans, Hannibal chose this form of suicide, also chosen by Romeo

poison