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
Process of deflouridation of water is - 
Select and explain. 
A. Nalgonda technique, B. NINH, C. Sand filter, D. Parboiling
A: Nalgonda technique
Answer: A: Nalgonda technique 
Explanation: The National Environmental Engineering Research Institute,Nagpur developed a technique for removing flouride by chemical treatment.It is called Nalgonda technique for deflourination of water.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-596