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
[{'content': 'The defluoridations process of drinking water developed by the NEERI is popularly known as – \nSelect and explain. \nA. Activated sludge process, B. Recarbonation process, C. Nalgonda process, D. Double pot method', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]