This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
The sewage ground water is disposed by 
Select and explain. 
A. Oxidation pond, B. Activated sludge process, C. Soakage pit, D. Any of the above
B: Activated sludge process
Answer: B: Activated sludge process 
Explanation: None