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': 'Cavity conditioning in ART is done by \nSelect and explain. \nA. Cocoa Butter, B. Petroleum Jelly, C. 37% Phosphoric Acid, D. 10% Polyacrylic Acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]