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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: PART: CHARLES 
Clue: In the '80s, he played Charles Ryder, a central character in TV's "Brideshead Revisited"

SOLUTION: jeremy irons

PROBLEM: Category: ISLANDS 
Clue: Delos, the smallest of this country's Cyclades Islands, was a shrine to Apollo in ancient times

SOLUTION: greece

PROBLEM: Category: ON THE "LAM" 
Clue: It's the eleventh letter of the Greek alphabet

SOLUTION:
lambda