TASK DEFINITION: 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.
PROBLEM: What size bullet does an ak 47 shoot?

SOLUTION: 7.62 caliber 39mm rounds

PROBLEM: Who published the moscow mathematical papyrus in 1930?

SOLUTION: Struve, Vasilij Vasil'evič, and Boris Turaev

PROBLEM: Who wrote the theme song for phineas and ferb?

SOLUTION:
Dan Povenmire, Jeff "Swampy" Marsh, Michael Culross, Michael Walker, Carl Williams