The Blood Grouping Was Discovered by__________ ?
Correct answer: B. Karl Landsteiner
- A. Robert Oppenheimer
- B. Karl Landsteiner
- C. Dr Hollerith
- D. None of them
Explanation
Karl Landsteiner discovered the ABO blood-group system in 1900 by identifying differences among human blood samples. Oppenheimer was a physicist, while Hollerith developed an early data-processing machine.
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