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': 'Pontic design not indicated in anterior region: \nSelect and explain. \nA. Ovate pontic, B. Modified ridge lap pontic, C. Stein pontic, D. Spheroidal pontic', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]