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
The following  symbol indicates: 
Select and explain. 
A. Radioactive caution, B. Recycle, C. Biohazard, D. Cytotoxic
A: Radioactive caution
Answer: A: Radioactive caution 
Explanation: None