This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Langerhans cells in skin are - 
Select and explain. 
A. Antigen presenting cells, B. Pigment producing cells, C. Keratin synthesizing cells, D. Sensory neurons
A: Antigen presenting cells
Answer: A: Antigen presenting cells 
Explanation: 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