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
Theodore Croll 1986 is associated with: 
Select and explain. 
A. Use of 18% hydrochloric acid and pumice - microabrasion, B. Use of 12 fluted bur to remove the defects, C. Bleaching techniques, D. Dakin's solution
A: Use of 18% hydrochloric acid and pumice - microabrasion
Answer: A: Use of 18% hydrochloric acid and pumice - microabrasion 
Explanation: None