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': 'Self etching primer is another name of: \nSelect and explain. \nA. 4th generation DBA., B. 5th generation DBA., C. 6th generation DBA., D. 7th generation DBA.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]