<prompt> Langerhans cells are:Phagocytic cellsAntigen presenting cellsSeen in auto immune conditionsSeen in chronic infection  <response>: Answer is B Antigen presenting cells : Langerhans cells are characteristic Antigen presenting cells Langerhans cells are clear dendritic Q cells situated among the cells of stratum spinosum slun. Q They are believed to be antigen processing cells. Q They are S100 positive Q on immunohistochemical studies. On electron microscopy: they lack melanosomesQ contain characteristic organelle, the Birbecks granule.Q 