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.

Input: Consider Input: Who discovered the center of the milky way galaxy?

Output: a team of radio astronomers, led by Joseph Lade Pawsey


Input: Consider Input: Who wrote the first code of law that was not subject to the king's will?

Output: Thomas Jefferson et al.


Input: Consider Input: When was canada's first railway line opened?


Output: 1836