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
Micro abrasion involves the use of: 
Select and explain. 
A. Sulphuric acid, B. Acetic acid, C. Phosphoric acid, D. Hydrochloric acid
D: Hydrochloric acid
Answer: D: Hydrochloric acid 
Explanation: None