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: 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
mexico

Category: THE HECUBA, YOU SAY 
Clue: Hecuba lays a guilt trip on this eldest son for going into his final combat
hector

Category: FATHERLY NICKNAMES 
Clue: "The Father of the Phonograph"

thomas edison