This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Antigen processing cells are all of the following, except: 
Select and explain. 
A. Astrocytes, B. Dendritic cells in lymphoid follicles, C. Reticulum cells of lymph nodes, D. Langerhan's cells
A: Astrocytes
Answer: A: Astrocytes 
Explanation: 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)