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, people with type B blood have B antigens on their red blood cells. The immune system produces antibodies against antigens not present. So, type B blood has anti - A antibodies (to avoid reacting with A antigens) and no anti - B antibodies (as B antigens are present). So only anti - A antibodies are present.

Answer:

Only anti - A antibodies are present.