Correct Answer:
C. Karl Landsteiner
The groundbreaking discovery of the ABO blood group system fundamentally transformed medical practices, particularly in the field of blood transfusions. Understanding blood types is crucial for preventing adverse reactions during transfusions.
- Karl Landsteiner, an Austrian physician, is correctly credited with this monumental discovery in 1901. His identification of A, B, and O blood types, and later AB, earned him the Nobel Prize in 1930, making safe and effective blood transfusions a reality.
- Edward Jenner is celebrated for his pioneering work on the smallpox vaccine, a significant contribution to immunology, but unrelated to blood groups.
- William Harvey is renowned for accurately describing the systemic circulation of blood, explaining how the heart pumps blood throughout the body, a different but equally vital physiological discovery.
Therefore, Karl Landsteiner is the definitive answer for the discovery of the blood group system.