Concept:Blood group compatibility depends on the presence or absence of antigens and antibodies.Explanation:• Group AB has no anti-A or anti-B antibodies, so it can receive from all groups, but it can donate only to another AB recipient.• Group O has no A or B antigens, so it can donate to any group, but can receive only from group O.• Therefore, the true statement is that a person of blood group AB can donate blood only to another person of blood group AB.Answer:A. person of blood group AB can donate blood only to another person of blood group AB