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 overbite-overjet relations of anterior teeth are determined primarily by esthetics and \nSelect and explain. \nA. Phonetics, B. Mastication, C. Pouting, D. Modiolus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]