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': 'AH plus & AH 26 are \nSelect and explain. \nA. Root canal cements, B. Medicated root canal paste, C. Fillers, D. Root canal filling material', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]