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 of the following can be used in maxillary central incisor area \nSelect and explain. \nA. Modified Ridge lap, B. Saddle, C. Conical, D. Sanitary', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]