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 an example of intraoral tracer? 
Select and explain. 
A. Height, B. Philip, C. Stansbery, D. Messerrnan
D: Messerrnan
Answer: D: Messerrnan 
Explanation: None