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
Technique used to remove superficial stains: 
Select and explain. 
A. Macro abrasion, B. Micro abrasion, C. Superoxol, D. Mc inn's solution
B: Micro abrasion
Answer: B: Micro abrasion 
Explanation: None