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 won the most world cup in cricket?

SOLUTION: Which country won the most world cup in cricket?

PROBLEM: Who played in the odd couple on broadway?

SOLUTION: Who played Oscar Madison in the odd couple on the original broadway performance?

PROBLEM: Who sang vocals on wish you were here?

SOLUTION:
Who sang vocals on the original "Wish You Were Here" single?