This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Antigen presenting cells are- \nSelect and explain. \nA. Langerhans cell, B. Macrophage, C. Cytotoxic T cells, D. Helper T cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Robbins basic pathology 6th edition. Chapter diseases of immunity. langerhan cells are antigen presenting cells.', 'role': 'assistant'}]