When whole blood is stored with an anticoagulant at $4^{\circ}C$,the $K^+$ ions move out from the $RBC$ into the plasma. The most likely reason for this is that

$A$ person with antigen $A$ in $RBC$ and antibody $b$ in plasma belongs to blood group

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-$B$)

Choose the correct statements regarding human blood:
$I$. The volume of blood in an adult is $5 \; L$.
$II$. It constitutes $30-35 \; \%$ of the total extracellular fluid.
$III$. Glucose concentration in the blood is $50 \; mg / 100 \; mL$.
$IV$. Cholesterol concentration in the blood is less than $200 \; mg / 100 \; mL$.
$V$. Urea level in the blood is $10 \; mg / 100 \; mL$.
The option with correct statements is:

With regard to the $ABO$ blood typing system,if a man who has type $B$ blood and a woman who has type $O$ blood were to have children,what blood types could the children have?

$A$ significant decrease in the number of lymphocytes due to a deficiency of folic acid is known as: