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
All of the following are true regarding removal of dentin smear layer during root canal preparation except: 
Select and explain. 
A. Removal of dentin smear layer is done by using 37% EDTA, B. Dentin smear layer contains debris and microoroganism, C. Removal of dentin smear layer removes microorganism, D. Removal of dentin smear layer is enhanced by EDTA
A: Removal of dentin smear layer is done by using 37% EDTA
Answer: A: Removal of dentin smear layer is done by using 37% EDTA 
Explanation: None