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:
When did the rolling stones play in hyde park?
answer:
When did the Rolling Stones play in Hyde Park for free?


question:
Who won the popular vote in 2017 presidential election?
answer:
Who won the popular vote in 2017 Rwandan presidential election?


question:
When did the persons case start and end?
answer:

When did the persons case begin?