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:
Where do purple martins go for the winter?

Ex Output:
Amazon River Basin


Ex Input:
When did nigeria become a federation of 19 states?

Ex Output:
1976


Ex Input:
Who sang these boots were made for walking first?

Ex Output:

Nancy Sinatra