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': 'Which incisor has most commonly 2 roots ? \nSelect and explain. \nA. Lower Central incisor, B. Lower Lateral incisor, C. Upper Central incisor, D. Upper lateral Incisor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]