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
Which of the following is not a prefabricated pontic: 
Select and explain. 
A. Long pin facing., B. Pontip., C. Perel pontic., D. Sanitary facing.
C: Perel pontic.
Answer: C: Perel pontic. 
Explanation: Example of prefabricated pontics are:
Trupontic, Long pin facing,
Flatback, Sanitary facings, Reverse pin facing, Pontips.