Which of the following are examples of biohazards?

• A. Bacteria, viruses, spores, and toxins.
• B. Water, air, and soil.
• C. Plastic, glass, and metal.
• D. Food, water, and salt.

Answer: (A)

Biohazards are biological agents or materials that can cause harm to people, animals, or the environment. Bacteria, viruses, spores, and toxins fit this definition because they originate from living organisms or are products of biological processes and can cause infection or toxic effects. The other items listed are not biological agents themselves; water, air, and soil are environmental media (they can carry hazards if contaminated) and plastic, glass, and metal are inanimate materials. Food, water, and salt are everyday substances that may become contaminated, but they aren’t biological hazards by default.