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': 'Which generation of bonding system combines the primer and bonding agent into a single step? \nSelect and explain. \nA. Fourth, B. Fifth, C. Sixth, D. Seventh', 'role': 'user'}, {'content': 'Answer: B \nExplanation: FIFTH GENERATION\xa0\xa0\n\nTo decrease the number of steps PRIME AND BOND WERE COMBINED.\xa0\nETCH +\xa0 \xa0(PRIME+BOND).\xa0\nCalled self priming adhesive.\xa0\xa0\nBond strength 17-24 MPA.\xa0\nLess number of steps less post operative sensitivity.\xa0\n\nEg: Prime and bond NT,\xa0Adper single bond, Opti bond solo.\nReference- Sturdevant 6th ed', 'role': 'assistant'}]