The ABO blood group classification system, still used today to determine blood type, was discovered by which scientist?

Explanation

The ABO blood group system was discovered by Austrian scientist Karl Landsteiner in the early twentieth century, a finding that explained why some blood transfusions succeeded while others caused dangerous reactions. His discovery earned him the Nobel Prize in Physiology or Medicine in 1930 and remains fundamental to safe blood transfusion practices used around the world today. Landsteiner later also contributed to the discovery of the Rh blood factor. Explore more Everyday Science MCQs on mcqstutor to keep practicing.