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 Input:
Who played keyboard on the beatles rooftop concert?

Ex Output:
Billy Preston


Ex Input:
Who published the moscow mathematical papyrus in 1930?

Ex Output:
Struve, Vasilij Vasil'evič, and Boris Turaev


Ex Input:
What is the main source of income in egypt?

Ex Output:

Tourism