Infectious waste should be placed in containers that are:

Infectious waste must be managed carefully to ensure the safety of patients, healthcare workers, and the environment. Proper labeling of waste containers is essential because it communicates the type of waste contained within, thereby ensuring that individuals handling the waste can take appropriate precautions. This reduces the risk of exposure to harmful pathogens and maintains compliance with health regulations.

Proper labeling also aids in the sorting and processing of waste, facilitating its safe disposal and preventing cross-contamination with non-infectious waste. The use of specific color codes or biohazard symbols is common practice in hospitals and other healthcare settings to make it readily identifiable.

The other options, while they may address aspects of waste management, do not fulfill the primary requirement for ensuring safety and regulatory compliance related to hazardous materials. For instance, containers made of lead or those designed to be incinerated might not be necessary for all types of infectious waste, and while plastic may be suitable, it does not inherently indicate the container's appropriateness for infectious waste unless properly labeled.