Blood Group was discovered by .

Correct option is B

The correct answer is:(B) Karl Landsteiner

• Karl Landsteiner discovered the ABO blood group system in 1901.

• His groundbreaking work enabled safe blood transfusions, which saved millions of lives during surgeries and emergencies.

• Landsteiner identified the A, B, AB, and O blood types by discovering that certain substances in the blood clump together when mixed.
• His work led to the understanding of blood compatibility, which is critical in medicine, especially in organ transplants and blood donations.
• He was awarded the Nobel Prize in Physiology or Medicine in 1930 for his discovery.
• Rh factor, another important blood group antigen, was discovered by Karl Landsteiner and Alexander Wiener in 1940.

Additional Information:

• William Harvey: Known for discovering the circulation of blood in the human body, not blood types.

• Pavlov: Famous for his work on classical conditioning and the Pavlovian response, unrelated to blood groups.

• Alexandar Fleming: Discovered penicillin, an antibiotic, but did not contribute to blood type research.