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:

Blood type B has B antigens on red blood cells. To prevent agglutination (clumping), the blood contains antibodies against the antigen it does not have. Since it has B antigens, it has anti - A antibodies. Anti - B antibodies would attack its own B antigens, so they are not present.

Answer:

Only anti - A antibodies are present.