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 plays captain hook in once upon a time?

SOLUTION: Colin O'Donoghue

PROBLEM: Who plays gabe on when calls the heart?

SOLUTION: Mitchell Kummen

PROBLEM: Who was the first president who lived in the white house?

SOLUTION:
John Adams