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
pH and duration of Action of EDTA is 
Select and explain. 
A. 7.2-7.3 and 15 min, B. 6.8-6.9 and 12 min, C. 7.2-7.3 and 12 min, D. 6.8-6.9 and 15 min
A: 7.2-7.3 and 15 min
Answer: A: 7.2-7.3 and 15 min 
Explanation: None