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:
Who was the original actor who played maigret?
answer:
Who was the actor who played Maigret in nearly all of the 1960 TV series?


question:
What airline has its hub in charlotte nc?
answer:
What major airline has its hub in charlotte nc?


question:
When was the movable type printing technique invented?
answer:

When was ceramic movable type developed?