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 is the best selling novelist of all time?
Dame Agatha Mary Clarissa Christie, Lady Mallowan, DBE

Who has sold the most records in the uk?
The Beatles

Who was the first soldier to be buried at arlington national cemetery?

William Henry Christman