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
[{'content': 'HBPT (etidronic acid) acts as \nSelect and explain. \nA. Chelating agent like EDTA, B. Tissue dissolving agent like NaOCl, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HBPT acts as chelating agent and does not affect tissue dissolving capacity of NaOCl.', 'role': 'assistant'}]