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': "NALGONDA technique' is used in - \nSelect and explain. \nA. Enedmic-fluorosis, B. Epidemic-dropsy, C. Endemic-ascites, D. Neurolathyrism", 'role': 'user'}, {'content': "Answer: A \nExplanation: The National Environmental Engineering Research Institute Nagpur developed a techniwue for removing flouride by chemical treatment. it is called Nalgonda techniqueREF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-596", 'role': 'assistant'}]