TASK DEFINITION: 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.
PROBLEM: Who won the 2017 british open golf tournament?

SOLUTION: Which person won the 2017 british open golf tournament?

PROBLEM: When did the ussr agree to a unified germany inside of nato?

SOLUTION: When did Gorbachev express agreement with a unified Germany inside of NATO?

PROBLEM: Who made up the big three in ww2?

SOLUTION:
Who made up the big three in ww2 as country?