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.

[Q]: When did the last episode of seinfeld air?
[A]: May 14, 1998


[Q]: How did will smith lose his arm in irobot?
[A]: a car crash


[Q]: Who defines economics as the science of wealth?
[A]:
Adam Smith