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': 'Which of the following has least sensation for pain \nSelect and explain. \nA. Lips, B. Anterior tongue, C. Gingiva, D. Buccal mucosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]