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: HEIR CONDITIONING 
Clue: 37-year-old Reza Pahlevi is the exiled heir to this country's "Peacock Throne"

SOLUTION: iran

PROBLEM: Category: PEOPLE FROM PLACES 
Clue: Novocastrian is a posh name for residents of this British city on the Tyne

SOLUTION: new castle

PROBLEM: Category: "Y"s GUYS 
Clue: He was mayor of Moscow from 1985-1987; now he's president of his country

SOLUTION:
boris yeltsin