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 consistency, answers should be in all lower cased letters.
PROBLEM: Category: FILTHY RICH 
Clue: Worth over $15 billion, Robson, son of Sam, runs this company, the USA's largest private employer

SOLUTION: wal-mart

PROBLEM: Category: EUROPEAN DINING 
Clue: It's said the Witchery by the Castle, on Castle Hill in this Scottish city, is haunted by several ghosts

SOLUTION: edinburgh

PROBLEM: Category: THE LAW 
Clue: The extent of territorial waters is defined in the 1982 U.N. "Convention on the Law of" this

SOLUTION:
the sea