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
All of the following are methods of sewage disposal except 
Select and explain. 
A. River outfall, B. Land treatment, C. Oxidation ponds, D. Bangalore method (composting)
D: Bangalore method (composting)
Answer: D: Bangalore method (composting) 
Explanation: Sewage is waste-water from a community, containing solid and liquid excreta, derived from houses, street and yard washings, factories, and industries. It resembles diy water with an unpleasant smell. Modern sewage treatment plants are now available for sewage purification based on biological principlesOther methods of sewage disposal Sea outfallRiver outfallLand treatmentOxidation pondsOxidation ditchesRef: Park; 23rd ed; Pg 765