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.

When was the song you're so vain written?
1971

Actor who plays john bates in downton abbey?
Brendan Coyle

What's carly's last name in icarly?

Shay