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
All of the following are fiber posts except: 
Select and explain. 
A. Carbon fiber reinforced., B. Polyethylene fiber reinforced., C. Glass fiber reinforced., D. Aluminium fiber reinforced.
D: Aluminium fiber reinforced.
Answer: D: Aluminium fiber reinforced. 
Explanation: None