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': 'What does this symbol signify? \nSelect and explain. \nA. Radiation hazard, B. Recyclable material biohazard, C. Waste, D. Fan at high speed', 'role': 'user'}, {'content': 'Answer: A \nExplanation: This symbol\xa0is used to depict radiation in the area.', 'role': 'assistant'}]