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 was the most widely read author of his generation, and within Germany he acquired the status of a prophet. According to the prevailing view among historians, his anti-Jewish rhetoric contributed significantly to the development of antisemitism in Germany, and in the 1930s and 1940s provided an "ideal underpinning" for the Nazis' attacks on Jews. Reinhold Lewin writes that anybody who "wrote against the Jews for whatever reason believed he had the right to justify himself by triumphantly referring to Luther." According to Michael, just about every anti-Jewish book printed in the Third Reich contained references to and quotations from Luther. Heinrich Himmler wrote admiringly of his writings and sermons on the Jews in 1940. The city of Nuremberg presented a first edition of On the Jews and their Lies to Julius Streicher, editor of the Nazi newspaper Der Stürmer, on his birthday in 1937; the newspaper described it as the most radically anti-Semitic tract ever published. It was publicly exhibited in a glass case at the Nuremberg rallies and quoted in a 54-page explanation of the Aryan Law by Dr. E.H. Schulz and Dr. R. Frercks.

Question:
How did Der Sturmer describe Luther's On the Jews and their Lies

radically anti-Semitic