Which sign is used on materials considered to contain infectious organisms, blood, and body fluids?

• A. Radiation sign
• B. Laser sign
• C. Fire sign
• D. Biohazard sign

Answer: (D)

Biological hazard labeling signals a risk from infectious agents or materials that could transmit disease. The biohazard symbol is used on containers, bags, cabinets, or surfaces that may contain blood, body fluids, tissues, cultures, or other potentially infectious materials. Seeing this symbol prompts you to use appropriate precautions—gloves, eye protection, proper containment, and safe disposal according to biosafety procedures. The other signs address different risks: radiation signs warn about radioactive sources, laser signs indicate laser hazards, and fire signs warn about fire hazards. So the biohazard symbol is the marker used for infectious materials.