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.

The Reformation, specifically referred to as the Protestant Reformation, was a schism in Western Christianity initiated by Martin Luther and continued by John Calvin, Huldrych Zwingli, and other early Protestant Reformers in 16th-century Europe. It is usually considered to have started with the publication of the Ninety-five Theses by Martin Luther in 1517 and lasted until the end of the Thirty Years' War with the Peace of Westphalia in 1648.
who were the main leaders of the reformation