Question: Dr. Fritz was a hypothetical surgeon channeled by practitioners of what pseudoscience?
Context: The Kröhnke pyridine synthesis is reaction in organic synthesis between α-pyridinium methyl ketone salts and α, β-unsaturated carbonyl compounds used to generate highly functionalized pyridines. Pyridines occur widely in natural and synthetic products, so there is wide interest in routes for their synthesis.  The method is named after Dr. Fritz Kröhnke. Einstein's Gift is a play written by Canadian playwright Vern Thiessen in 2003.  Through the recollections of Albert Einstein, the play focuses on the life and career of German chemist Dr. Fritz Haber, who helped improve living conditions with his work on nitrogen fixation.  His work was later used by the German army to produce chlorine gas used in Second Battle of Ypres in the First World War.  As Dr. Haber becomes increasingly involved with the German army, the play depicts how his actions and newly forged military connections affect his relationship with his wife, Clara, and his assistant, Otto.  As his passion in science intertwines with nationalistic pride, Haber manifested himself a scientist devoted to a country that never accepted his Jewish origin. Psychic surgery, a pseudoscience constituting medical fraud, is when a practitioner creates the illusion of performing surgery with his or her bare hands and uses trickery, fake blood, and animal parts to convince the patient that the diseased lesions were removed and that the incision spontaneously healed. Dr. Fritz Wittmann (born 21 March 1933) is a German politician (CSU) and lawyer. Jean-Pierre Fernand Noël Abbat (June 17, 1928 – August 1, 1993) was, with Dr. Fritz Hartmann, the first person in the USA to manufacture polyurethane. Adolf Fritz, generally called Dr. Fritz (Munich, ?  – Estonia, 1918), was a hypothetical German surgeon whose spirit has allegedly been channeled by several Brazilian psychic surgeons, starting with Zé Arigó in the 1950s and continuing up to the present.  There is no proof that he actually existed. The Cabinet of Dr. Fritz was a 1984–85 binaural radio drama series produced by Thomas Lopez and the ZBS Foundation for NPR.  At the beginning of each show, it was suggested that listeners wear headphones. Dr. Fritz Vollmar served as the Director General of the World Scout Foundation. Thomas Lopez, aka Meatball Fulton, (born 1935) is president of the ZBS Foundation and one of the foundation's founders.  He writes and produces the ZBS Foundation's audio drama productions.  Some of these aired in 1984-85 as part of ZBS' stereo radio series "The Cabinet of Dr. Fritz".  When he was working in radio in the 1960s, Lopez took "Meatball Fulton" out of Rolling Stone as his "nom de plume". The Skeptics' Guide to the Universe is a weekly, 80-minute podcast hosted by Steven Novella, MD, and a panel of "skeptical rogues".  It is the official podcast of the New England Skeptical Society.  The show features discussions of recent scientific developments , and interviews authors, people in the area of science and other famous skeptics.  The show also includes discussions of myths, conspiracy theories, pseudoscience, the paranormal, and many general forms of superstition, from the point of view of scientific skepticism.  Steven Novella, the host of the show, has been particularly active in debunking pseudoscience in medicine.  His activities include opposing the claims of anti-vaccine activists, homeopathy practitioners and individuals denying the link between HIV and AIDS.
Answer: Psychic surgery