This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Langerhans cells in skin are \nSelect and explain. \nA. Antigen presenting cells, B. Pigment producing cells, C. Keratin synthesising cells, D. Sensory neurons', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Antigen presenting cells", 'role': 'assistant'}]