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
The Iodine content in iodized salt at production point should be: 
Select and explain. 
A. 10 ppm, B. 20 ppm, C. 30 ppm, D. 40 ppm
C: 30 ppm
Answer: C: 30 ppm 
Explanation: 30 ppm