Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The first Rh ^ +ve child of an Rh ^ -ve mother rarely suffers from erythroblastosis foetalis. Reason (R) : The Rh antigens of the foetus do not get exposed to the Rh ^ -ve blood of the mother in the first pregnancy as the two bloods are well separated by the placenta. In the light of the above sta

Step-by-step solution

The Assertion is true. Erythroblastosis foetalis typically affects subsequent Rh ^ +ve pregnancies, while the first Rh ^ +ve child of an Rh ^ -ve mother is usually unaffected. The Reason is also true and correctly explains the Assertion. According to NCERT, during the first pregnancy, the Rh antigens of the foetus do not get exposed to the maternal blood because the two blood supplies are well separated by the placenta. Sensitisation of the mother's blood generally occurs only during the delivery of the first child