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]: What is the title of the first-person shooter science fiction video game, released by id Software in 1993?
[EX A]: doom

[EX Q]: Who had a hit single in the seventies with `I Wish It Could Be Christmas Everyday`?
[EX A]: wizzard

[EX Q]: Which of the Halogens, with the atomic number 17, is missing from - Flourine, Bromine, Iodine and Astatine?
[EX A]:
chlorine