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.

[Q]: Which king experienced regicide at the hands of Shakespeare's Macbeth?
[A]: king duncan


[Q]: Franco Alfano completed which Puccini opera after the composers death in 1924?
[A]: turandot


[Q]: Which of the halogens has the lowest atomic number (9)?
[A]:
fluorine