What type of door is prohibited for use when leading to a garage?

The most appropriate answer to the question about which type of door is prohibited for use when leading to a garage is a hollow-core, metal interior door. In residential safety codes, garages are considered areas with a higher risk of fire due to the presence of flammable materials and vehicles.

A hollow-core, metal interior door does not provide the necessary fire resistance or structural integrity required for a door leading from a garage to an interior living space. Fire safety regulations typically require at least a solid wood or a fire-rated door to separate living areas from the garage. Solid wood doors are generally more effective as they can delay the spread of fire better than hollow or less robust doors.

In contrast, options such as solid wood doors, patio sliding doors, and glass entry doors may meet specific criteria for entryways in other contexts but do not provide the essential security and fire resistance that a garage door separation must have. Thus, it's crucial to adhere to building codes designed for fire safety and to ensure that the structure protects the living space from potential hazards associated with garage environments.