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: Dental
[{'content': 'A common feature of melanocytes, Langerhans cells, and Merkel cells is that: \nSelect and explain. \nA. Produce melanin., B. Have a low or no desmosomal attachment with surrounding keratinocytes., C. All are dendritic cells., D. All are pressure sensitive.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Melanocytes are residing in the basal layer of epithelium.\xa0Langerhans cells are found in the upper layer of skin and mucosal\xa0\xa0epithelium restricted to zones of ortho keratinization.\xa0Merkel cells are also present among basal cells.', 'role': 'assistant'}]