Which source provides the most comprehensive information on hazardous materials, including composition, hazards and first aid measures?

• A. Emergency Response Guidebook
• B. Manufacturer's label
• C. Material Safety Data Sheet
• D. Safety Data Sheet

Answer: (C)

Material Safety Data Sheet provides the most complete reference because it includes the material’s composition or ingredients, explains all the hazards, and gives precise first aid measures. It also covers handling and storage, protective equipment, spill response, and regulatory information, offering a full picture for both prevention and emergency action. The Emergency Response Guidebook focuses on initial incident guidance and doesn’t provide the full ingredient lists or medical treatment steps. A manufacturer’s label is only a brief warning and precaution summary. The Safety Data Sheet is the modern term for this same comprehensive document, and MSDS and SDS are often used interchangeably. So for composition, hazards, and first aid, the MSDS (SDS) is the best source.