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Which of the following are examples of lymphocytes?

  1. Red blood cells

  2. White blood cells

  3. T and B cells

  4. Platelets

The correct answer is: T and B cells

Lymphocytes are a specific type of white blood cell that play a critical role in the immune system, particularly in recognizing and responding to pathogens such as viruses and bacteria. In the context of the options provided, T and B cells are two primary types of lymphocytes. T cells are crucial for cell-mediated immunity, directly attacking infected cells or coordinating the immune response. B cells, on the other hand, are primarily responsible for humoral immunity, producing antibodies that neutralize pathogens. Both T and B cells are central to the adaptive immune response, showing how specialized these lymphocytes are in defending the body against infections. The other options represent different components of blood or immune cells that do not fall under the category of lymphocytes. Red blood cells are primarily responsible for oxygen transport; white blood cells encompass a wider range of immune cells, not limited to lymphocytes; and platelets are essential for blood clotting. Thus, T and B cells are the specific examples of lymphocytes because they are the ones directly involved in the adaptive immune response.