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': 'The high level clear cell present in the oral epithelium is: \nSelect and explain. \nA. Melanocyte, B. Lymphocyte, C. Merkel cell, D. Langerhans cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]