In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.
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Question: Who had the most rebounds in the nba?

Answer: Who had the most rebounds in the nba in the 2016-2017 season?


Question: When did we become the united states of america?

Answer: When, based on evidence, did we begin calling ourselves the united states of america?


Question: When did manchester united last won a trophy?

Answer:
As of the 2016-2017 season, when did manchester united last win a trophy?