Biohazardous waste includes any material exposed to which of the following?

• A. Blood
• B. Urine
• C. Saliva
• D. Sweat

Answer: (A)

The key idea is that biohazardous waste is anything that has been in contact with blood. Blood can carry bloodborne pathogens like hepatitis B, hepatitis C, and HIV, so materials exposed to blood are treated as potentially infectious and handled with heightened precautions. Fluids such as urine, saliva, or sweat are not automatically classified as biohazardous unless there is visible blood or they contain other infectious materials. In practice, anything touched by blood is placed in biohazard bags and handled with proper protective measures. Therefore, blood is the correct choice.