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': 'Bi-zygomatic width divided by 16 gives approximate mesiodistal width of \nSelect and explain. \nA. Upper central incisor, B. Lower central incisor, C. Upper anterior teeth, D. Lower anterior teeth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]