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 was the presiding officer at the constitutional convention?
George Washington

Who played chip douglas on my three sons?
Stanley Livingston

Who played mr wally in national lampoon's vacation?

Edward Vincent Bracken