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.

[EX Q]: In the Shakespeare play 'Macbeth', which character carries Macbeth's head on stage?
[EX A]: macduff

[EX Q]: Hydromel is a very old alcoholic drink made with fermented what?
[EX A]: honey

[EX Q]: What word is used in mathematics to mean if and only if?
[EX A]:
if and only if