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.

[Q]: Who played mr. carter in welcome back carter?
[A]: Seth Woodbury MacFarlane


[Q]: When did arches national park become a national park?
[A]: November 12, 1971


[Q]: Article iv of the constitution explains the relationship between the states and?
[A]:
the United States federal government