Question: Elisabeth Marschall was the Head Nurse at Ravensbruck during what war? 
Context: Baroness Sophie Mannerheim (1863-1928) is a famous nurse known as pioneer of modern nursing in Finland.  She was daughter of a count and sister of a former Finnish President, marshal Carl Gustaf Emil Mannerheim.  Her career started as a bank employee for 6 years until she got married in 1896.  After her divorce in 1902 she was trained in nursing at the Nightingale School at St Thomas' Hospital in London.  Returning home she was appointed as head nurse of Helsinki Surgical Hospital and later elected President of the Finnish Nurses' Association, a position she had for 24 years.  As a result of her international involvement she was also elected President of the International Council of Nurses (ICN).  Sophie Mannerheim was, together with Dr Arvo Ylppö, founder of the Children's Castle (Lastenlinna) hospital in Helsinki as well as the . Nazi human experimentation was a series of medical experiments on large numbers of prisoners, including children, by Nazi Germany in its concentration camps in the early to mid 1940s, during World War II and the Holocaust.  Chief target populations included Romani, Sinti, ethnic Poles, Soviet POWs, disabled Germans, and most prominently of all, Jews from across Europe. Conrad Diehl (1843–1918) was Mayor of the City of Buffalo, New York, serving from 1898 to 1901.  He was born in Buffalo on July 17, 1843.  He graduated from the University of Buffalo with a medical degree in 1866.  On May 5, 1869, he married Caroline Trautmann in New York City; she died in 1888 and he remarried in 1892 to Lois Masten, head nurse at Buffalo General Hospital.  From 1870 to 1878, he was surgeon and major of the 65th Regiment, of the New York National Guard.  From 1874 on, he was either attending or consulting physician at Buffalo General Hospital. Tessa Cam Rowe (born January 30, 1981) is a Filipino artist, auteur and entrepreneur.  She is mostly known as being the head mistress (or "Head Nurse") of Dr. Sketchy's Anti-Art School Philippines, one of the hundred branches of the globally renowned Dr. Sketchy's Anti-Art School, founded by art model and illustrator, Molly Crabapple. Clara Maass Medical Center is a hospital in Belleville, Essex County, New Jersey, United States, that is part of the Barnabas Health.  It was founded in 1868 as the Newark German Hospital, and was renamed in 1952 in honor of Clara Maass, a former nurse who trained there at the hospital's Christina Trefz Training School for Nurses, and become the hospital's head nurse.  Maass' 1901 death during yellow fever experiments attracted national attention. Selma Mayer, known as Schwester Selma (German for "Sister Selma" or "Nurse Selma") (February 3, 1884 – February 5, 1984) was the head nurse at the original Shaare Zedek Hospital on Jaffa Road in Jerusalem for nearly 50 years.  For many years she was the right-hand assistant of the hospital's founding director, Dr. Moshe Wallach.  Working long hours and with limited infrastructure, she trained and supervised all personnel at the hospital from 1916 to the 1930s, and founded the Shaare Zedek School of Nursing in 1934.  She never married, and resided in a room in the hospital until her last day.  In her later years she became known as the "Jewish Florence Nightingale" for her decades of selfless devotion to patient welfare. Matron is the job title of a very senior or the chief nurse in several countries, including the United Kingdom, its former colonies, such as India, and also the Republic of Ireland.  The chief nurse, in other words the person in charge of nursing in a hospital and the head of the nursing staff, is also known as the Senior Nursing Officer, matron, nursing officer, or clinical nurse manager in UK English; the head nurse or director of nursing in US English, and the nursing superintendent or matron in Indian English, among other countries in the Commonwealth of Nations. Elisabeth Marschall (27 May 1886 – 3 May 1947) was the Head Nurse ("Oberschwester") at the Ravensbrück concentration camp.  Her duties included selecting prisoners for execution, overseeing medical experiments, and selecting which prisoners would be shipped to Auschwitz.  At the Hamburg Ravensbrück Trials, she was found guilty and sentenced to death. Christine Francine Wilhelmina "Tine" Van Rompuy (born 28 August 1955, in Leuven) is a Belgian nurse, politician and syndicalist, member of the Workers Party of Belgium, a leftist party in Belgium.  Van Rompuy is the sister of Herman Van Rompuy, EU's first full-time president of the European Council, and the Flemish politician Eric Van Rompuy.  She earned her diploma as a psychiatric nurse in 1977.  From 1977 to 1995 she worked as a psychiatric nurse in the head Psycho-Social Center of the Brothers of Charity in Leuven.  Since 2004 she is head nurse at the Central Patient Transport Service at the University Hospital of Leuven. Anna DeCosta Banks (September 2, 1869 - November 29, 1930) was employed at the Hospital and Training School for Nurses in Charleston, South Carolina, where she was the first head nurse.  Banks is known for her nursing career, as well as a later position held as superintendent for 32 years at the same training school for nurses.  Specifically designed for women of color, this hospital was later renamed McClennan-Banks Memorial Hospital in her honor.
Answer: World War II