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: Where do purple martins go for the winter?

SOLUTION: Amazon River Basin

PROBLEM: When is the last time liverpool won the premier league?

SOLUTION: 1989-90

PROBLEM: Who plays the doctor in to the bone?

SOLUTION:
Keanu Reeves