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': 'Perel Pontic is \nSelect and explain. \nA. Ovate, B. Conical, C. Hygienic, D. Modified sanitary', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]