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': 'Given symbol signifies: \nSelect and explain. \nA. Biohazard, B. Radiation hazard., C. Waste management, D. None of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]