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.

Example Input: Who played jennifer hart in hart to hart?
Example Output: Stefania Zofya Federkiewicz

Example Input: Journal of optics a pure and applied optics abbreviation?
Example Output: J. Opt.

Example Input: Who wrote rock and roll i gave you the best years of my life?
Example Output:
Kevin Johnson