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.

What season does burke come back in grey's anatomy?
10th season

Mark made by a seal or a stamp?
impression

When did the last us ww1 vet dies?

February 27, 2011