Which statement is true A? There was a consensus among scientists that germs caused diseases by the 19th century or B. There was a consensus among scientists that germs caused diseases before the nineteenth century

Answer 1

Statement A is true: There was a consensus among scientists that germs caused diseases by the 19th century. The germ theory of disease, which posits that microorganisms are the cause of many diseases, became widely accepted in the latter half of the 19th century, particularly due to the work of scientists like Louis Pasteur and Robert Koch. Before this time, various other theories about disease causation were prevalent, but germ theory gained significant support during the 19th century.