What color is used to indicate health hazards in the NFPA label system?

Answer: B — Blue

In the NFPA (National Fire Protection Association) labeling system, blue is specifically used to indicate health hazards. This color system helps to quickly communicate the hazards associated with materials, and the blue section of the label outlines any health risks that may be posed to individuals exposed to the material. Health hazards may include toxicity, carcinogenicity, or other potential health effects. By utilizing the blue color in the NFPA label, responders can immediately recognize the level of health risk and take appropriate precautions to ensure safety during handling or in the event of an incident. This system is an essential tool for emergency personnel and workers dealing with hazardous materials, allowing for quick identification and informed decision-making.