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 sings the song you find out who your friends are?

Ex Output:
Tracy Lawrence


Ex Input:
Who is the nobel peace prize named for?

Ex Output:
Alfred Bernhard Nobel


Ex Input:
Two thin membranes surround the lungs. what are these membranes known as?

Ex Output:

visceral pleura and parietal pleura