instruction:
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.
question:
Who is the husband of Helen of Troy in Troilus and Cressida?
answer:
menelaus

question:
Who directed the 1987 film 'Full Metal Jacket'?
answer:
stanley kubrick

question:
King Albert II abdicated as monarch of which country on July 21st 2013 in favour of his son Crown Prince Phillipe?
answer:
belgium