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
Iodine deficiency control programme ? 
Select and explain. 
A. Health education, B. Water testing, C. Foification of salt, D. None
C: Foification of salt
Answer: C: Foification of salt 
Explanation: Ans. is 'c' i.e., Foification of salt Iodized salt (salt foified with iodine) is most economical, convenient and effective means of mass prophylaxis in endemic area.