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 did the first answering machine come out?
answer:
When did the first commercially successful answering machine come out?


question:
Who plays beric dondarrion on game of thrones?
answer:
Who plays Beric Dondarrion on Game of Thrones in Seasons 3, 6-8?


question:
Who is the oldest senator currently serving in congress?
answer:

Who is the oldest Senator serving in Congress from January 3, 2015 t0 December 8, 2016?