Discovered that blood can be grouped into A, B, AB and O in 1900. Who is credited with this discovery?

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Multiple Choice

Discovered that blood can be grouped into A, B, AB and O in 1900. Who is credited with this discovery?

Karl Landsteiner’s work established the ABO blood group system. He showed in 1900 that human blood can be categorized according to how its red cells react with specific sera, revealing four distinct types: A, B, AB, and O. This meant that some transfusions would cause clumping and immune reactions, while others would be safe, depending on the donor and recipient types. His discovery made routine blood typing possible and laid the essential groundwork for safe blood transfusions and modern transfusion medicine. The other names are notable in medicine for different achievements, but they are not associated with discovering the ABO blood groups.

Karl Landsteiner’s work established the ABO blood group system. He showed in 1900 that human blood can be categorized according to how its red cells react with specific sera, revealing four distinct types: A, B, AB, and O. This meant that some transfusions would cause clumping and immune reactions, while others would be safe, depending on the donor and recipient types. His discovery made routine blood typing possible and laid the essential groundwork for safe blood transfusions and modern transfusion medicine. The other names are notable in medicine for different achievements, but they are not associated with discovering the ABO blood groups.

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