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': 'Common design which can be employed while fabricating a sanitary pontic: \nSelect and explain. \nA. Bar sanitary pontic., B. Fish-belly pontic., C. Perel pontic., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fishbelly pontic is also known as conventional pontic.\nPerel pontic is also known as modified sanitary pontic or arc-fixed partial denture.', 'role': 'assistant'}]