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': "A Dentin 'Primer'? \nSelect and explain. \nA. Etches the dentin, B. It increases the surface energy & wets the dentin surface, C. Removes the smear layer, D. Conditions the dentin", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]