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 sang a crazy little thing called love?

SOLUTION: What band sang a crazy little thing called love in 1979?

PROBLEM: Who won the afc championship game this year?

SOLUTION: Who won the AFC Championship Game in the 2017 NFL season?

PROBLEM: Who is the actor who plays lord voldemort?

SOLUTION:
Who is the actor who plays lord voldemort as flashback in Harry Potter and the Philosopher's Stone?