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 did the united states acquire texas from?

Answer: Mexico


Question: Who has the best winning percentage in college football history?

Answer: Michigan


Question: Who saved cooper and rachel at the river?

Answer:
Nathan Royal Scott