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Erythroblastosis foetalis occurs when

ABoth parents have identical Rh-negative status
BBoth parents have identical Rh-positive status
CA Rh-positive mother carries a Rh-negative foetus
DA Rh-negative mother carries a Rh-positive foetus
Answer & Solution
Correct answer: D. A Rh-negative mother carries a Rh-positive foetus
Anti-Rh antibodies in a previously sensitised Rh-negative mother cross the placenta during a subsequent Rh-positive pregnancy and destroy foetal RBCs. Anti-D immunoglobulin given to the mother after first delivery prevents future sensitisation.
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