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


[Q]: Who presides over any impeachment trial of the president of the united states?
[A]: Chief Justice of the United States


[Q]: How many cubes are in a 5x5x5 cube?
[A]:
125