Which of the following should be avoided in biological marriage?

Options

A. `A^(+)` boy and `A^(+)` girl
B. `A^(+)` boy and `A^(-)` girl
C. `O^(+)` boy and `O^(+)` girl
D. `O^(-)` boy and `O^(+)` girl

Answer

B

Explanation

In second delivery, the foetus will develop erythroblastosis featalis due to passing of Rh antibodies from mother to foetus.