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:
How many miles is the mexican border to the united states?

Ex Output:
1,954 mi


Ex Input:
Who played the boy in mad max 2?

Ex Output:
Emil Minty


Ex Input:
The neurotransmitter used at the neuromuscular junction (nmj) is?

Ex Output:

acetylcholine