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.

Input: Consider Input: Why did the united states pursue a policy of containment?

Output: prevent the spread of communism after the end of World War II


Input: Consider Input: Who plays sarah in cheaper by the dozen?

Output: Alyson Stoner


Input: Consider Input: Who delivers the state of the union address?


Output: President of the United States