**Core Concept**
The composition of hospital waste is a critical aspect of waste management in healthcare settings. It involves categorizing various types of waste, including infectious, non-infectious, hazardous, and non-hazardous waste, to ensure proper disposal and minimize environmental and health risks.

**Why the Correct Answer is Right**
Hospital waste composition varies depending on the type of healthcare facility and the services provided. However, metal waste accounts for approximately 1% of total hospital waste. This is because metal waste includes items such as medical equipment, surgical instruments, and other metal-based materials that are used in healthcare settings. The correct percentage of metal waste is essential for effective waste management and recycling programs.

**Why Each Wrong Option is Incorrect**
**Option B:** Paper waste constitutes a significant portion of hospital waste, but the correct percentage is around 10-15%, not 10%. This is because hospitals generate a substantial amount of paper waste from patient records, medical charts, and other documentation.
**Option C:** Glass waste is also a component of hospital waste, but the correct percentage is around 2-3%, not 5%. This is because glass is used in various medical equipment and containers, but it is not as prevalent as other types of waste.
**Option D:** Infectious waste, which includes items contaminated with blood, bodily fluids, and other potentially infectious materials, accounts for a small percentage of total hospital waste, typically around 1-2%, not 3%. This is because proper infection control measures and waste management practices are in place to minimize the generation of infectious waste.

**Clinical Pearl / High-Yield Fact**
It is essential for healthcare facilities to implement effective waste management systems, including segregation, storage, and disposal of waste, to minimize environmental and health risks. This includes regular monitoring of waste composition and implementing recycling programs for non-hazardous waste.

**✓ Correct Answer: A. Metal 1%**