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.
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Question: Who is the parent company of dunkin donuts?

Answer: Who was the parent company of Dunkin Donuts in 1990?


Question: Who sang on evanescence bring me to life?

Answer: Who sang on Evanescence's song "Bring Me to Life"?


Question: When did lead stop being used in paint uk?

Answer:
When was lead voluntarily eliminated as a drying agent in paint in the UK?