In the child of which one of the following couples,Erythroblastosis fetalis is likely to occur?

What is the ratio of $WBC$ to $RBC$ in human blood?

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

Which organs are responsible for filtering out destroyed red blood cells?

The $ABO$ blood grouping system was discovered by whom?

Select the incorrect statements with reference to $Rh$ grouping.
$A$. Erythroblastosis foetalis is a condition observed having foetus with $Rh^{+ve}$ blood and mother with $Rh^{+ve}$ blood.
$B$. $Rh$ antigen is observed on $RBCs$ in the majority of human beings.
$C$. Before blood transfusion, $Rh$ group should also be matched.
$D$. $Rh$ incompatibility is observed when a pregnant mother is $Rh^{-ve}$ and the foetus is $Rh^{+ve}$.
$E$. Erythroblastosis foetalis can be avoided by administering anti-$Rh$ antibodies to the mother immediately after the delivery of the second child.
Choose the answer from the options given below: