Q. Who discovered ABO blood system?

A
Weiner
B
Karl Landsteiner
C
William Harvey
D
Denis
Solution:

In 1930, Landsteiner was awarded the Nobel Prize for his description of the human ABO blood group system, which he himself considered an accidental discovery. Karl Landsteiner discovered human blood groups in 1900 and laid the foundation for the modern medical practice of blood transfusion

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