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.

Where do purple martins go for the winter?
Amazon River Basin

Who was the winner of total drama island?
Gwen

When was the last time iran went to world cup?

June 2018