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
Iodized salt in iodine deficiency control programme is 
Select and explain. 
A. Secondary prevention, B. Primary prevention, C. Tertiary prevention, D. Primordial prevention
B: Primary prevention
Answer: B: Primary prevention 
Explanation: None