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': 'In later phases of plaque development the organism predominates \nSelect and explain. \nA. Staphylococci, B. Streptococci, C. Rods and filaments, D. Vibrio and spirochetes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]