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 facial expressions indicate the rest position \nSelect and explain. \nA. Lips are even anteroposteriorly with slight contact., B. Skin around the eyes and chin is relaxed., C. Relaxation around the nostrils with unobstructed breathing., D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Facial expression:\xa0\nThe following indicates rest position:\n\nLips are even anteroposteriorly with slight contact.\nSkin around the eyes and chin is relaxed.\nRelaxation around the nostrils with unobstructed breathing.\n\nWith experience the dentist learns to recognize, these features depicting rest position and will make measurements accordingly.', 'role': 'assistant'}]