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: Who won the 2014 world cup that was held in brazil?

SOLUTION: Germany

PROBLEM: Who does natsuru end up with in kampfer?

SOLUTION: Akane Mishima

PROBLEM: When did penn st join the big ten?

SOLUTION:
1990