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 did oprah winfrey play in the color purple?
Sofia

Who played nikki kapowski on saved by the bell?
Laura Mooney

Who has scored most test runs for england?

Sir Alastair Nathan Cook