Which of the following is not a current human blood type?

a. A

b. AB

c. B

d. C

The answer to your question is C.

Explanation:

Blood is classified according to the kind of antigens it has, there are 4 types of blood.

Group A is a type of blood that only has the A antigen in red cells

Group B is the type of cell that only has the B antigen in red cells

Group AB has both antigens A and B in red cells.

Group O has no antigens in blood cells.