Question

a person with blood type a can receive blood from type (s)

a a and b

b o only

c a only

d a and o

Explanation:

Blood type A has A antigens on red blood cells and anti - B antibodies in plasma. When receiving blood, if the donor's blood has antigens that the recipient's antibodies can react with (like B antigens for blood type A), it can cause agglutination.

• Blood type A can receive blood from type A (as it has the same A antigen, no new antigen to react with).
• Blood type O has no A or B antigens on red blood cells (universal donor in this context as it won't cause an antigen - antibody reaction with blood type A's antibodies).
• Blood type B has B antigens which would react with blood type A's anti - B antibodies.

Answer:

d. A and O