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 was the 20th prime minister of canada?

SOLUTION: Jean Chretien

PROBLEM: Who played boo radley in the movie to kill a mockingbird?

SOLUTION: Robert Selden Duvall

PROBLEM: The world's oldest epic tale told in poetry is called the epic of?

SOLUTION:
Epic of Gilgamesh