Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Name the Mexican founder of the vast corporation Grupo Carso, and the world's richest man 2010-13?
carlos slim

'La donna e mobile' comes from which Verdi opera?
rigoletto

Leonato is the main character in what Shakespeare play?

much ado about nothing