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.

Ex Input:
Mark made by a seal or a stamp?

Ex Output:
impression


Ex Input:
Neurotransmitter filled packets in the presynaptic neuron are called?

Ex Output:
Vesicle cluster


Ex Input:
Where can oil be found in the united states?

Ex Output:

Texas, Federal Gulf of Mexico, North Dakota, California, Alaska, Colorado