Which of the Following Statements About the Development of Modern

Which of the following statements about the development of modern medicine is NOT true?

A) Prior to the nineteenth century, physicians based their treatments on folklore and superstition.
B) Doctors have only begun to understand the causes of disease in the last 200 years.
C) For most of their history, physicians have done more harm than good with their treatments.
D) The practice of healing has always been separate from religion.