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 is the descending aorta located in the mediastinum?

Ex Output:
posterior mediastinal cavity


Ex Input:
Who wrote rick and morty season 3 episode 3?

Ex Output:
Jessica Gao


Ex Input:
Who was president when iowa became a state?

Ex Output:

James Knox Polk