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
In carrier base gutta percha the plastic carrier size of 40- 90 are made by? 
Select and explain. 
A. Plastic liquid crystal, B. Poly propylene, C. Poly sulphide, D. Poly sulphone
D: Poly sulphone
Answer: D: Poly sulphone 
Explanation: None