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.

Ex Input:
Who plays agent romanoff in iron man 2?

Ex Output:
Scarlett Johansson


Ex Input:
Who has the most atp masters 1000 titles?

Ex Output:
Rafael Nadal


Ex Input:
Who played the major in keeping up appearances?

Ex Output:

Peter Cellier