When defining blood group according to the AB0 system, using salt solutions of monoclonal antibodies, agglutination didn't occur with any of the solutions. What blood group is it?

Answer options

1. AB (IV)
2. 0 (I)
3. A (II)
4. B (III)
5. -

Explanation

Group O – has neither A nor B antigens on red cells (but both A and B antibodies are in the plasma) so when in contact with monoclonal antibodies it had no agglutinations because there the absence of antigens on red cells.