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The four blood groups were discovered by

  • A.Emil kraepelin
  • B.Karl Landsteiner
  • C.Francis galton
  • D.Trofim lysenko

Answer: B

Karl Landsteiner discovered them.

He found in 1901 that mixing blood from different people sometimes caused clumping, and identified the groups A, B and O; AB was added by his students two years later. The discovery made transfusion safe and won him the Nobel Prize in 1930.

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