Antigen processing cells are all of the following, except:: (A) Astrocytes, (B) Dendritic cells in lymphoid follicles, (C) Reticulum cells of lymph nodes, (D) Langerhan's cells
Answer is A. Antigen presenting cells include:Macrophages: APC of bloodModified macrophages:Dendritic reticulum cells in follicles of lymph nodesInterdigitating reticulum cells in the paracoical zone of lymph nodesLangerhans cells: APC of skinAstrocytes do not function as APC(ref: Robbin's 8/e p192)