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': 'All of the following are true for traditional solution liner, except: \nSelect and explain. \nA. It is not necessary in moderately deep cavities under glass ionomer restoration, B. Have Film thickness of 1 -50 microns, C. Do not provide thermal or electric insulation, D. Protect the pulp from reaction products leaching out of restoration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]