instruction:
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.
question:
Where does the earth's magnetic field originate?
answer:
Earth's core


question:
Who published the moscow mathematical papyrus in 1930?
answer:
Struve, Vasilij Vasil'evič, and Boris Turaev


question:
What was tom's wife name on the jeffersons?
answer:

Helen Willis