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: When did the rolling stones play in hyde park?

SOLUTION: When did the Rolling Stones play in Hyde Park for free?

PROBLEM: In which year india's capital shifted from calcutta to delhi?

SOLUTION: Which year was it announced that India's capital would shift from Calcutta to Delhi?

PROBLEM: When was game of thrones season 5 filmed?

SOLUTION:
When did game of thrones season 5 begin filming?