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': "Arkansa's stone is lubricated with light mineral oil to \nSelect and explain. \nA. Prevent heat build up, B. Remove metal particles, C. Prevent if from drying up, D. All the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]