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': 'Dimensional changes and flow of sealer is according to which ADA specification Number \nSelect and explain. \nA. No. 55, B. No. 54, C. No. 56, D. No. 57', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]