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 achieved a victory at the battle of marathon?

SOLUTION: What country achieved a victory at the battle of marathon?

PROBLEM: When did what happened to monday come out?

SOLUTION: When did the film What Happened to Monday come out in Locarno Festival?

PROBLEM: Who plays queen cersei on game of thrones?

SOLUTION:
Who plays the adolescent Queen Cersei on Game of Thrones?