Given the task definition, example input & output, solve the new input case.
In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Example: This list contains the top 25 accounts with the most followers on the social photo-sharing platform Instagram. As of May 2018, the most followed user is Instagram's own account, with over 235 million followers. Selena Gomez is the most followed individual, with over 137 million followers. Ten accounts have exceeded 100 million followers on the site.
Output: who has the maximum number of followers on instagram
The answer is talking about the Instagram accounts that have the most followers. The question asking about the maximum number of followers. So this is a good example.

New input case for you: The doctrine was confirmed in the Plessy v. Ferguson Supreme Court decision of 1896, which allowed state-sponsored segregation. Though segregation laws existed before that case, the decision emboldened segregation states during the Jim Crow era, which had commenced in 1876 and supplanted the Black Codes, which restricted the civil rights and civil liberties of African-Americans during the Reconstruction Era.
Output:
who put the separate but equal doctrine in place