Waste collected under the yellow category should be treated by:

Correct option is D

Yellow category waste typically refers to biomedical waste that is potentially infectious, such as human tissues, blood-soaked bandages, and other contaminated materials. This type of waste should be treated by incineration, which safely disposes of harmful pathogens and ensures the complete destruction of hazardous materials.
Explanation of options: (a) ✘ Incorrect. Autoclaving is used for sterilizing equipment but is not suitable for disposing of infectious biomedical waste. (b) ✘ Incorrect. Hydroclaving is not a standard method for treating biomedical waste. (c) ✘ Incorrect. Microwaving is used in some cases for medical waste treatment but is not the primary method for yellow category waste. (d) ✔ Correct. Incineration is the most effective method for treating yellow category waste, ensuring proper disposal and destruction of infectious material.