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 played keyboard on the beatles rooftop concert?
[EX A]: Billy Preston

[EX Q]: Where does the earth's magnetic field originate?
[EX A]: Earth's core

[EX Q]: A calculation from input values such as add subtract multiply and divide?
[EX A]:
binary opterations