This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Concentration of diethylcarbomazine in DEC medicated salt in endemic filariasis is - 
Select and explain. 
A. 2-4 gm\/kg, B. 3-6 gm\/kg, C. 5-10 gm\/kg, D. 10-15 gm\/kg
A: 2-4 gm\/kg
Answer: A: 2-4 gm\/kg 
Explanation: <p> DEC Medicated salt:- The use of DEC medicated salt is a special form of mass treatment using very low doses of the drug over a long period of time. Common salt medicated with 1-4 g of DEC per kg has been used for filariasis control in endemic areas of W.bancrofti and B.malayi . Treatment should be continue for 6-9 months {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.274}</p>