Which of the following is not a granulocyte?

Serum is:

What is the first site of hematopoiesis in a human embryo?

Plasma is a straw-coloured,viscous fluid constituting nearly $A$ $\%$ of the blood,$B$ $\%$ of the plasma is water,and proteins constitute $C$ $\%$ of it. Choose the correct option for the blanks $A, B$,and $C$.

In a medico-legal case of accidental interchange between two babies in a hospital,the baby with blood group $A$ could not be the child of parents with which of the following blood group combinations?

$Serum = .........$