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.

Who has the biggest nba contract in history?
James Harden

Who wrote dont it make my brown eyes blue?
Richard Leigh

Where was christianity most strongly established by ad 325?

Roman Empire