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


question:
Who sang on the banks of the river?
answer:
Who sang background on the 1959 song with lyrics on the banks of the river?


question:
Where are most of the us oil refineries located?
answer:

Where with respect to geographical features are most of the us oil refineries located?