A primary "antigen presenting cell," a cell that presents an antigen to a helper T cell,is a:

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Macrophages are the primary antigen presenting cells. They can present antigens to both helper T cells and cytotoxic T cells. B cells can also present antigens to helper T cells, but their main function is to produce antibodies. T cells do not present antigens, but can become activated by antigens presented on other cells. Plasma cells are derived from B cells and produce large amounts of antibodies. Chondrocytes are cartilage cells and are not involved in the immune response.

A Primary "Antigen Presenting Cell," a Cell That Presents an Antigen