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
Given symbol signifies: 
Select and explain. 
A. Biohazard, B. Radiation hazard., C. Waste management, D. None of the above.
B: Radiation hazard.
Answer: B: Radiation hazard. 
Explanation: None