Which among the following mediate cell-mediated immunity in human body?

T-lymphocytes.

Among the options provided, T-lymphocytes mediate cell-mediated immunity in the human body.

T-lymphocytes, also known as T-cells, are a type of white blood cell involved in cell-mediated immunity. They recognize and destroy infected or abnormal cells directly, respond to specific antigens presented by other cells, and play a crucial role in coordinating and regulating the immune response. B-lymphocytes, on the other hand, are responsible for humoral immunity by producing antibodies that target pathogens or foreign substances in body fluids, not cell-mediated immunity. Thrombocytes refer to platelets and are primarily involved in blood clotting, not immune responses.