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


question:
Who was the first person voted off big brother?
answer:
Who was the first person voted off the first season of American Big Brother?


question:
When did the first rainbow vacuum come out?
answer:

When did the first vacuum officially called the rainbow come out?