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
Common design which can be employed while fabricating a sanitary pontic: 
Select and explain. 
A. Bar sanitary pontic., B. Fish-belly pontic., C. Perel pontic., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: Fishbelly pontic is also known as conventional pontic.
Perel pontic is also known as modified sanitary pontic or arc-fixed partial denture.