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 episodes in this game of thrones season 7?

SOLUTION: seven episodes

PROBLEM: When does crossing over occur in prophase 1?

SOLUTION: pachytene stage

PROBLEM: Who has the highest ppg average in nba history?

SOLUTION:
Wilt Chamberlain