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': 'Arch- fixed partial denture is: \nSelect and explain. \nA. Modified sanitary pontic., B. Modified ridge lap pontic., C. Modified spheroidal pontic., D. Ovate pontic.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]