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:
Which king experienced regicide at the hands of Shakespeare's Macbeth?
answer:
king duncan


question:
Who wrote the novels Enigma and The Ghost?
answer:
robert harris


question:
At a banquet, the ghost of whom enters and sits in Macbeth's chair?
answer:

banquo