Most naí¯ve T cell activation occurs where and in response to what?
1)In the skin in response to cytokines
2) In secondary lymphoid organs in response to antigen presentation by dendritic cells
3) In the infected tissues in response to antigen presentation by macrophages
4) In the blood in response to antigen presentation by monocytes
5) E) In the thymus in response to antigen presentation by thymic medullary epithelial cells