instruction:
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.
question:
Who is the first person to go to the moon?
answer:
Who were the first people to land on the moon?


question:
When was ben simmons drafted to the nba?
answer:
What date was ben simmons drafted to the nba?


question:
Where is the series once upon a time filmed?
answer:

Where is the principal photography of Once Upon A Time filmed?