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.
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Question: Who played the lead actress role in movie mirror mirror?

Answer: Lily Collins


Question: Who wrote the song imagine by the beatles?

Answer: John Lennon and Yoko Ono


Question: Who sang at the super bowl 2017 half time show?

Answer:
Lady Gaga