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]: The Hoover Dam is on the border of Arizona and which other state?
[A]: nevada


[Q]: Leonora is the heroine of which opera premiered in 1805?
[A]: fidelio


[Q]: Which is the only country to have played qualifying matches for the football World Cup on 5 different continents?
[A]:
israel