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.

[Q]: Who sings backup on thank you led zeppelin?
[A]: Who sings backup on Thank You by Led Zeppelin and plays drums for the band?


[Q]: Who won the last football world cup 2017?
[A]: Who won the last football u-17 world cup 2017?


[Q]: The big bang theory season 11 guest star?
[A]:
Who are all the big bang theory season 11 guest stars?