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': 'Major difference between self-etch primer and total etch adhesive? \nSelect and explain. \nA. Bond strength, B. Time, C. No need of wet bonding agent, D. Amount of smear layer removal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]