This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, 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: NEERI developed a technique for removing fluoride by chemical deflouridation of water called Nalgonda technique. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 596", 'role': 'assistant'}]