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 the song spirit in the sky?
[A]: Who sings the original song "Spirit in the Sky" from 1969?

[Q]: How many days does it take an embryo to implant?
[A]: How many days does it most likely take for a human embryo to implant?

[Q]: Who played the marshal in the man who shot liberty valance?
[A]:
Who played the marshal in the film The Man Who Shot Liberty Valance?