This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
The disposal of night soil and refuse is by - 
Select and explain. 
A. Chemical sterilization, B. Burning, C. Composting, D. Any of the above
C: Composting
Answer: C: Composting 
Explanation: Composting is method of combined disposal of refuse and nightsoil or sludge.Process of nature whereby organic matter breaks down under bacterial action resulting in formation of humus like compost. The by-products are carbondioxide,water,and heat.This heat destroys the eggs of flies and pathogens.The end product compost contains no or few pathogens and is good soil builder as it contains nitrates and phosphates. Parks textbook of preventive and social medicine.K Park. Edition 23. page no:755