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 wrote the strange case of dr jekyll and mr hyde?

Ex Output:
Robert Louis Stevenson


Ex Input:
What does the rosenberg self esteem scale measure?

Ex Output:
self-esteem


Ex Input:
Who owns the united nations building in new york?

Ex Output:

United Nations