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.

The office season 8 episode 7 guest stars?
The office season 8 episode 7 guest star's character?

Who were the first european to reach the americas and when did they arrive?
Who were the first Europeans to reach the Americas?

Who came up with the idea for the voice?

What is the American TV series The voice based on?