Question

Which one of the following couple were suggested by doctors to not have more than one child?

• A. Rh${}^{+}$ male and Rh${}^{-}$ female
• B. Rh${}^{-}$ male and Rh${}^{+}$ female
• C. Rh${}^{+}$ male and Rh${}^{+}$ female
• D. Rh${}^{-}$ male and Rh${}^{-}$ female

Answer 1

The correct option is A Rh${}^{+}$ male and Rh${}^{-}$ female

Rh incompatibility occurs when a Rh- negative mother is impregnated by a Rh- positive father. The result can be Rh- positive baby. In such a case, the baby’s Rh antigens will be recognized as foreign invaders. The mother’s blood cells attack the baby’s as a protective mechanism and can cause erythroblastosis fetalis. If the mother is pregnant with her first baby, Rh incompatibility is not as much of a concern. However, when the Rh- positive child is born, the mother’s body creates antibodies against the Rh factor, which will attack the blood cells if she becomes pregnant with another Rh- positive baby.

Hence, the correct answer is option A.