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Identify the following individual:
Lived: 1868 - 1943
Discovered the human blood group system, paving the way for safe blood transfusions. Also discovered the Rh factor in blood, proved polio is an infectious disease spread by a virus, and discovered haptens.
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| Johannes Kepler |
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| Charles Babbage |
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| James Watt |
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| Karl Landsteiner |
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The correct answer was Karl Landsteiner
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