In which a professional antigen presenting cell (APC) responsible for activating T-helper cells? (at least two answers)
A. A cell that has its class II transplantation MHC proteins decorated with pieces of foreign proteins.
B. Any dendritic cells and macrophages such as the Kupffer cells of the liver, microglial cells of the brain and alveolar macrophages in the lungs.
C. red blood cells in the blood.
D. megakaryocytes and platelets.
E. epithelial cells of the skin