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
Defloridation of water is done by which technique 
Select and explain. 
A. Nalgonda, B. Nagpur, C. Patna, D. Kasauli
A: Nalgonda
Answer: A: Nalgonda 
Explanation: None