Match the following columns:Column-I (Blood G | vedclass

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(C) In the $ABO$ blood grouping system, the presence or absence of surface antigens on red blood cells determines the blood type.$1$. Blood group $A$

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$P-III, Q-II, R-I, S-IV$

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(C) In the $ABO$ blood grouping system, the presence or absence of surface antigens on red blood cells determines the blood type.$1$. Blood group $A$ has antigen $A$ on RBCs and antibody $b$ (anti-$A$) in plasma.$2$. Blood group $B$ has antigen $B$ on RBCs and antibody $a$ (anti-$B$) in plasma.$3$. Blood group $AB$ has both antigens $A$ and $B$ on RBCs and no antibodies in plasma.$4$. Blood group $O$ has no antigens on RBCs and both antibodies $a$ and $b$ in plasma.Therefore, the correct matching is:$P$ (Blood group $A$) matches with $III$ (antibody $b$).$Q$ (Blood group $B$) matches with $II$ (antibody $a$).$R$ (Blood group $AB$) matches with $I$ (absent).$S$ (Blood group $O$) matches with $IV$ (antibodies $a, b$).Thus, the correct sequence is $P-III, Q-II, R-I, S-IV$.

Column-$I$ (Blood Group)	Column-$II$ (Antibodies)
$P$. $A$	$I$. Absent
$Q$. $B$	$II$. $a$ (anti-$B$)
$R$. $AB$	$III$. $b$ (anti-$A$)
$S$. $O$	$IV$. $a, b$ (anti-$A$ and anti-$B$)

Match the following columns:
Column-$I$ (Blood Group) Column-$II$ (Antibodies)
$P$. $A$ $I$. Absent
$Q$. $B$ $II$. $a$ (anti-$B$)
$R$. $AB$ $III$. $b$ (anti-$A$)
$S$. $O$ $IV$. $a, b$ (anti-$A$ and anti-$B$)

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Match the following columns:Column-$I$ (Blood Group)Column-$II$ (Antibodies)$P$. $A$$I$. Absent$Q$. $B$$II$. $a$ (anti-$B$)$R$. $AB$$III$. $b$ (anti-$A$)$S$. $O$$IV$. $a, b$ (anti-$A$ and anti-$B$)