What are t cells and b cells?
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a. lymphocytes
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b. pathogens
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c. antibodies
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d. antigens

Lymphocytes.

Explanation:

Lymphocytes are type of White blood Cells.These are classified as  T- lymphocyte, B-lymphocyte and Natural killer cells.Bone marrow is the site of production and maturation of B-lymphocyte.They are the only cells that can produce antibody.These also differentiate to form memory cells and result in adaptive immune response.The site of T-lymphocyte production is bone marrow and the site of their maturation is the thymus. T-cells do not produce antibodies but destroy Antigen presenting cells, cancerous cells virus infected cells etc.