You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Martin_Luther

Context:
Luther's rediscovery of "Christ and His salvation" was the first of two points that became the foundation for the Reformation. His railing against the sale of indulgences was based on it.

Question:
What became the foundation of the Reformation?

Christ and His salvation