B- and T-cells required for immune system are produced in

Both B-cells and T-cells of immune system are produced in:

Both B cells and T cells of immune system are produced in

Both B cells and T cells of immune system are produced in

B-cells and T-cells, responsible for acquired immune response in the body, are formed in the

Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it

How do B-cells of the immune system respond to antigens?