Question

a person with blood group o can be transfused blood of only o group. why?

Answer 1

Type O plasma, containing both anti-A and anti-B antibodies, can only be given to O recipients. The antibodies will attack the antigens on any other blood type. Conversely, AB plasma can be given to patients of any ABO blood group, because it does not contain any anti-A or anti-B antibodies.

Answer 2

because o blood group contain some special cells which can be getted back with only donation of o blood group