Which of the following blood groups' person cannot donate blood to others?

Identify the incorrect statement regarding leucocytes.

To prevent coagulation,blood stored in a blood bank contains a small amount of:

In which of the following situations is there a risk factor for children of incurring erythroblastosis fetalis?

In a normal healthy woman,the number of $RBC$ per $mm^3$ of blood is.........

Assertion: The regulation of $RBC$ production is accomplished by $FSH$.
Reason: Erythropoietin hormone circulates to red bone marrow where it increases stem cell mitosis and speeds up the development of $RBCs$.