Which of the following are potentially hazardous?

• A. Disinfectants
• B. Inhalant anesthetics
• C. Test substances used in experiments
• D. All of the above

Answer: (D)

The main idea is that several common lab items can pose hazards, not just one category. Disinfectants can be corrosive, irritating to skin and eyes, and may release toxic fumes if mishandled. Inhalant anesthetics bring exposure risks to personnel from vapors and can be highly flammable, so proper ventilation, scavenging, and monitoring are essential. Test substances used in experiments can have a wide range of hazards—from acute toxicity to carcinogenicity or reproductive effects—requiring careful risk assessment, appropriate containment, PPE, and proper waste disposal. Because each of these categories can be hazardous in different ways, the correct answer is that all of the above are potentially hazardous.