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 among the following is not a type of wax: 
Select and explain. 
A. Casting wax., B. Utility wax., C. Carding wax., D. Japan wax.
D: Japan wax.
Answer: D: Japan wax. 
Explanation: Japan wax and cocoa butter are fat.