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 of the following contains primer and bonding agent in a single bottle and is known as "single component system" \nSelect and explain. \nA. 3rd generation, B. 4th generation, C. 5th generation, D. 6th generation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]