This answer is not correct; the AB blood type has antigens of both A and B, but no anti serum (I.e. no reaction to A or B) making it the Universal recieptant but not donor. AB can only donate to other AB recieptants
The answers to this question are wrong. AB blood type can only donate to AB do to the facts that both A and B have antigens around they surface that will cause other blood type to form antigens that will attacks that type blood. However, AB blood type is a universal recipient.
AB given to AB ONLY