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: Dental
The double pot method of adding chlorine to well water was devised by 
Select and explain. 
A. WHO, B. UNICEF, C. National Environment Engineering and Research Institute, D. ICMR
C: National Environment Engineering and Research Institute
Answer: C: National Environment Engineering and Research Institute 
Explanation: None