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
Nalgonda technique is used in 
Select and explain. 
A. Epidemic dropsy, B. Endemic ascites, C. Endemic fluorosis, D. Chlorination of water
C: Endemic fluorosis
Answer: C: Endemic fluorosis 
Explanation: None