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 is playing batman in the justice league movie?

SOLUTION: Who is playing batman in the 2017 justice league movie?

PROBLEM: Where does vanilla come from in the world?

SOLUTION: Which country is the top vanilla producer in the world?

PROBLEM: Where does to catch a thief take place?

SOLUTION:
Where does to Catch a Thief take place in terms of plotline?