Which white blood cell type includes B lymphocytes and T lymphocytes?

• A. Basophils
• B. Erythrocytes
• C. Lymphocytes
• D. Thrombocytes

Answer: (C)

Understanding white blood cell families helps here. B lymphocytes and T lymphocytes are part of the lymphocyte group, which is a key component of the adaptive immune system. Lymphocytes are specialized for targeted immune responses: B cells produce antibodies that recognize foreign invaders, while T cells coordinate immune actions and can kill infected cells. Because B and T cells both belong to this single cell family, the correct answer is the lymphocytes. Basophils are a different white blood cell type involved in allergic reactions and releasing histamine; erythrocytes are red blood cells that carry oxygen; thrombocytes are platelets that help with blood clotting. So the cell type that includes B and T lymphocytes is lymphocytes.