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: When did the first season of greys anatomy air?

SOLUTION: March 27, 2005

PROBLEM: Who elects the national people's congress in china?

SOLUTION: multi-tiered representative electoral system

PROBLEM: Who won the battle of shiloh confederate or union?

SOLUTION:
Union