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
HBPT (etidronic acid) acts as 
Select and explain. 
A. Chelating agent like EDTA, B. Tissue dissolving agent like NaOCl, C. Both, D. None
A: Chelating agent like EDTA
Answer: A: Chelating agent like EDTA 
Explanation: HBPT acts as chelating agent and does not affect tissue dissolving capacity of NaOCl.