The AB blood group was discovered by

Landsteiner

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De Castello and Steine

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Landsteiner and Weiner

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Bemsteine

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Solution

The correct option is B De Castello and Steine
Human blood groups A, B and O were discovered by Landsteiner in 1900, while the AB blood group was discovered by de Castello and Steini in 1902.
Therefore, the correct answer is option B.

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