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': 'Solvent used in varnish is/are: \nSelect and explain. \nA. Acetone, B. Alcohol, C. Ether, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Varnish—A material for application to the floor of a prepared cavity; a solution of natural gum, synthetic resins\xa0or resins dissolved in volatile solvent, such as acetone, ether\xa0or chloroform; not necessarily a cement.\nPhillip's science of dental material 12th edition page 309", 'role': 'assistant'}]