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: Where does vanilla come from in the world?

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

PROBLEM: Who has the most tries in the nrl?

SOLUTION: Who has the most career tries scored in the nrl?

PROBLEM: Who sang the song the day the music died?

SOLUTION:
Who sang lead on the original song featuring lyrics the day the music died?