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': 'An ANB angle 2° on the cephalogram usually indicates \nSelect and explain. \nA. An unfavorable relationship of mandible to\tmaxilla, B. A favorable relationship of maxillary alveolar base to mandibular alveolar base, C. Poor cranial growth with poor prognosis, D. Retruded maxillary incisor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]