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': '"Guidance to eruption" is another term for \nSelect and explain. \nA. Frankel\'s appliance, B. Activator, C. Serial extraction, D. Bionator', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]