The BEST source of information on a specific hazmat is:

• A. The manufacturer’s MSDS
• B. Industry safety bulletin
• C. Local safety posters
• D. Public safety announcements

Answer: (A)

For a specific hazmat, the manufacturer's MSDS (now often called the SDS) provides the most complete, product-specific safety information. It’s produced by the chemical’s maker and updated with the latest data, so it contains the exact hazards, required PPE, handling and storage guidelines, first aid procedures, and detailed spill or exposure response tailored to that substance. General sources like industry bulletins, local safety posters, or public safety announcements are useful for broad safety guidance, but they’re not specific to the particular chemical and may be outdated or insufficient for proper handling and emergency actions. Always start with the MSDS/SDS for the exact product, and use other sources only to supplement if needed.