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: Who sings change the world with eric clapton?

SOLUTION: Kenneth "Babyface" Edmonds

PROBLEM: Rotating part of dc motor is known as?

SOLUTION: armature

PROBLEM: Who plays will ferrell's dad in daddy's home 2?

SOLUTION:
John Lithgow