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': 'A Female patient aged 40 years comes for routine general examination. Full mouth radiographs are taken. Oval shaped radiolucent areas are seen in the root canals of maxillary central incisors Teeth are asymptomatic and show feeble response to vitality tests.\n\nIn case you suggest RCT what is your choice of irrigant? \nSelect and explain. \nA. Hydrogen peroxide, B. Saline, C. Chlorhexidine, D. Sodium hypochlorite', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]