# 2Jawapan pendekName the the cell that can be activated by APC?Helper T cellInactive helper T cellhelper T cellinactive helper T cell
# 3Jawapan pendekName the substance that is secreted by APC to activate helper T cell?Interleukin-1interleukin-1IL-1
# 4Jawapan pendekActivated helper T cell secrete a substance to activate B cell and cytotoxic T cell. Name the substance.Interleukin-2interleukin-2IL-2