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 won the best picture in the oscars?
[A]: Which film won the best picture in the 90th oscars?


[Q]: Who has the fastest selling album of all time?
[A]: What is the fastest selling album of all time in Canada?


[Q]: Who was involved in the ww1 christmas truce?
[A]:
Who was involved in the WWI Christmas truce of 2014 along the Western Front?