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
[{'content': 'All of the following are fiber posts except: \nSelect and explain. \nA. Carbon fiber reinforced., B. Polyethylene fiber reinforced., C. Glass fiber reinforced., D. Aluminium fiber reinforced.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]