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 plays agent romanoff in iron man 2?

Answer: Scarlett Johansson


Question: Who won season 6 worst cooks in america?

Answer: Kristen Redmond


Question: Who came up with six degrees of separation?

Answer:
Frigyes Karinthy