Question

if a person has type b blood, which statement describes the antibodies present in his or her blood?
only anti-a antibodies are present.
only anti-b antibodies are present.
both anti-a and anti-b antibodies are present.
neither anti-a nor anti-b antibodies are present.

Explanation:

In blood typing, individuals with type B blood have B antigens on their red blood cells. To avoid agglutination, they produce antibodies against the antigen they don't have. So, type B blood has anti - A antibodies (since they don't have A antigens, the body makes antibodies against A to prevent reaction with A - containing blood). They do not have anti - B antibodies because they have B antigens, and having anti - B would react with their own cells.

Answer:

A. Only anti - A antibodies are present.