Which system is responsible for removing wastewater and sewage from a building?

The drainage system is primarily responsible for the removal of wastewater and sewage from a building. This system encompasses the network of pipes and fixtures designed to transport waste away from sinks, toilets, showers, and other plumbing fixtures in a safe and efficient manner. The drainage system ensures that wastewater flows properly towards treatment facilities or septic systems, preventing potential health hazards and environmental contamination.

While other systems mentioned have their own roles, they do not specifically focus on the removal of wastewater. The water supply system is designed for delivering clean water to various points within a building, while the sewage system generally refers to a broader infrastructure that includes both the collection and the treatment of sewage, extending beyond just a single building. The waste management system is concerned with the handling and disposal of solid wastes rather than wastewater. Thus, the role of the drainage system in managing and transporting wastewater makes it the correct choice for this question.