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': 'The most accepted theory of tooth eruption is \nSelect and explain. \nA. Hydrodynamic theory, B. Clone theory, C. Periodontal ligament traction theory, D. Vascular theory', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]