Discussion
Which antibodies are found in the plasma of individuals with blood group A?
Answer: B
People with blood group A have anti-B antibodies in their plasma.
In the ABO system, a person's red cells carry the antigens of their own group, and the plasma carries antibodies against the antigens they lack. Group A red cells carry antigen A, so the plasma has anti-B.
Anti-A would attack their own red cells, so it is found in group B. Both anti-A and anti-B are found in group O, and group AB has neither antibody.
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