Blood Group was discovered by

Correct option is B

Karl Landsteiner discovered the ABO blood group system in 1901, revolutionizing blood transfusion practices.

Explanation:
● Landsteiner identified that blood could be categorized into four groups: A, B, AB, and O.
● His discovery reduced fatalities in blood transfusions by ensuring compatibility between donors and recipients.
● He also contributed to the identification of the Rhesus (Rh) factor, further improving transfusion safety.
● Landsteiner’s work earned him the Nobel Prize in Physiology or Medicine in 1930.
● The ABO system remains critical in modern medicine for surgeries, transfusions, and organ transplants.
● His research laid the foundation for hematology as a specialized field.

Information Booster:
● Blood types are determined by the presence or absence of antigens on red blood cells.
● The universal donor is blood group O, while AB is the universal recipient.
● Rhesus factor (+ or -) further classifies blood groups, crucial for transfusion compatibility.
● Blood group testing is mandatory for medical procedures and during pregnancies to prevent Rh incompatibility.
● Landsteiner’s legacy continues in blood donation and transfusion research.

Additional Information:

• (A) William Harvey: Discovered blood circulation
• (C) Pavlov: Known for his work on classical conditioning
• (D) Alexander Fleming: Discovered penicillin