<prompt> Langerhans cells in skin are -Antigen presenting cellsPigment producing cellsKeratin synthesizing cellsSensory neurons  <response>: Professional antigen-presenting cells, including macrophages, B cells, Langerhans cells and dendritic cells, present foreign antigens to helper T cells, while other cell types can present antigens originating inside the cell to cytotoxic T cells. Reff: Ananthanarayanan Panikers textbook of microbiology 9th edition pg: 138 