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
A 15% solution of EDTA has a pH of: 
Select and explain. 
A. 5.5, B. 7.3, C. 7.9, D. 7
B: 7.3
Answer: B: 7.3 
Explanation: None