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': 'Important function of thick liner: \nSelect and explain. \nA. Prevention of pulpal inflammation, B. Inducing reparative dentin formation, C. Both of the above, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: As the tooth preparation extends closer to the pulp, a thick liner or a base is used to augment dentin\xa0to the proper thickness range. Such a liner or base cannot harden by evaporation of solvent or water,\xa0 because it would not dry eﬀectively.\xa0\nMaterial used for this purpose hardens by a chemical reaction or is light-cured. In addition to thermal protection, liners are formulated to provide pulpal medication\xa0whenever possible.\nTwo important aspects of pulpal medication are the relief of pulpal inﬂammation\xa0and facilitation of dentinal bridging for physiologic protection.\xa0\nThe materials (eugenol and calcium\xa0hydroxide) most commonly used to provide these two functions are not mutually compatible and\xa0cannot be used in the same formulation.', 'role': 'assistant'}]