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: How many 10 cards are in a deck of 52 cards?

SOLUTION: 4

PROBLEM: What size bullet does an ak 47 shoot?

SOLUTION: 7.62 caliber 39mm rounds

PROBLEM: How long did the bombing of pearl harbor last?

SOLUTION:
Ninety minutes