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: Radiology
[{'content': 'All of the following are radiolucent EXCEPT \nSelect and explain. \nA. Glass, B. Lead, C. Rubber, D. Wood', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]