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': 'Prognosis is poor for furcation involvement of \nSelect and explain. \nA. Maxillary 1st premolar, B. Maxillary 2nd molar, C. Mandibular 1st premolar, D. Maxillary 2nd premolar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]