## **Core Concept**
The question tests knowledge on methods for disinfecting sputum, which is crucial in infection control, particularly for diseases spread through respiratory droplets. Disinfection of sputum is essential in healthcare settings to prevent the spread of infections.

## **Why the Correct Answer is Right**
Autoclaving is a process that uses high-pressure steam to sterilize equipment and supplies. This method is highly effective for disinfecting and sterilizing materials that can withstand high temperatures, including biological waste such as sputum. Autoclaving denatures proteins, disrupts cell membranes, and kills bacteria, viruses, and fungi, making it an effective method for handling infectious biological materials.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Pasteurization involves heating liquids to a lower temperature than autoclaving, typically around 161°F (72°C), and is commonly used for milk and sometimes for certain types of medical equipment. However, it may not be sufficient for all types of biological waste due to the variability in heat resistance of different pathogens.
- **Option B:** Formalin fixation is a method used for preserving tissues and cells, often in laboratory settings. While it can fix and preserve biological specimens, it might not be practical or sufficient for disinfecting large quantities of sputum.
- **Option C:** Incineration involves burning waste materials and is a highly effective method for destroying pathogens. However, the question specifically asks about disinfection of sputum, not destruction. Incineration would eliminate the pathogens but is not considered a disinfection method in the traditional sense.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that for effective infection control, the method of disinfection or sterilization should match the type of material being treated and the level of risk it poses. Autoclaving is a versatile and commonly used method in healthcare settings for treating infectious waste.

## **Correct Answer:** . Autoclaving