TASK DEFINITION: In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
PROBLEM: Actor who plays john bates in downton abbey?

SOLUTION: Brendan Coyle

PROBLEM: Who is the original singer of nothing compares to you?

SOLUTION: Prince Rogers Nelson

PROBLEM: Who plays desmond's mom in hacksaw ridge?

SOLUTION:
Rachel Anne Griffiths AM