In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

[EX Q]: Who sings the theme song from phineas and ferb?
[EX A]: Bowling for Soup

[EX Q]: What are freshmen called at the air force academy?
[EX A]: Fourth class cadets

[EX Q]: When did cultures in peru begin the practice of mummification?
[EX A]:
5th millennium BC