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
Arkansa's stone is lubricated with light mineral oil to 
Select and explain. 
A. Prevent heat build up, B. Remove metal particles, C. Prevent if from drying up, D. All the above
D: All the above
Answer: D: All the above 
Explanation: None