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.

Who sang i wish you peace by the eagles?
Bernie Leadon

Where does the earth's magnetic field originate?
Earth's core

When did the canon rebel t3i come out?

February 7, 2011