<prompt> Most potent stimulator of naive T cell isMature dendritic cellsFollicular dendritic cellsMacrophageBcell  <response>: Ref Robbins 9e p191 Naive T cells leave the thymus and home to secondary lymphoid organs. Dendritic cells are the most potent activators of naive T cells. DCs carry antigen from the periphery to the draining lymph nodes. ... CD28 signaling provides Signal 2 to T cells and is necessary for T cell activation. 