<prompt> Interleukin secreted by macrophages, stimulating lymphocytes is:IL-1INF alphaTNF alphaIL-6  <response>: Macrophages release IL-1 which stimulates the T-helper cells.The T-cells in response proliferate and release IL-2 which in turn stimulates still further T-cell proliferation and B cell proliferation and differentiation into plasma cells.ThusMacrophages releaseIL-1T-helper cells release IL-2 