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': 'The pontic of mandibular posterior region should be \nSelect and explain. \nA. Point contact, B. Saddle, C. Modified ridge lap, D. Ovate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]