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': 'Brachy cephalic individual usually has \nSelect and explain. \nA. Narrow dental arches, B. Broad dental arches, C. Normal dental arches, D. B or C', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]